Integrate #177 follow-up stack: #179 #180 #181 #182 #183 #186 #188

[jgruberf5]

Coordinated integration of the seven #177 follow-up PRs

Per #192 (bonnyr-f5's cross-PR conflict analysis), these seven PRs share the credential surface and the release/CI surface and cannot merge in arbitrary order — the #186×#188 pair conflicts on ~17 files including both auth test modules, with a coupling where the reserved-name guard needed by #186 lives in #188. This branch resolves the whole stack once, in #192's order, and validates the merged tree.

Merge order: #179 → #180 → #181 → #188 → #186 → #183 → #182

Included (each fully reviewed across rounds 2–6):

• Fix non-deterministic version derivation (SIGPIPE race) — PR #177 Blocker 1 #179 — breaking-change footer detection (paragraph/trailer-anchored, folded-footer + wrapped-prose safe, mawk+gawk verified)
• Sync Helm chart tag / appVersion / package.json with VERSION — PR #177 Blocker 2 #180 — version-artifact consistency (writer/checker symmetry, real vacuity guard)
• Release workflow: republish recovery path + RC/loop-guard robustness — PR #177 Blocker 3 #181 — release republish idempotency + :latest guards + HTTP-status registry probe
• Wire gitleaks / shellcheck / script self-test CI gates — PR #177 Major #182 — CI hygiene (gitleaks range scan, shellcheck, commit-lint with machine-identity exemption)
• Fix registry/cosign/upgrade metadata + USER-gate authoring guide — PR #177 Majors #183 — release docs accuracy (present-tense once Stop shipping a default admin credential; generate it and enforce rotation #186/Stop shipping the MCP service default credential; make Helm use the mcp account #188 mechanisms are present)
• Stop shipping a default admin credential; generate it and enforce rotation #186 — default admin credential invalidation + backend MCP wiring + async-dispatch threadpool
• Stop shipping the MCP service default credential; make Helm use the mcp account #188 — MCP service-account provenance (is_service_account), v2_154/v2_155 migrations, remediation

Credential-surface resolution (#186×#188): combined, not either-or — single _RESERVED_HUMAN_USERNAMES guard, #188's provenance + unconditional stale-disable + migrations plus #186's published-default rotation + backend MCP_SERVICE_PASSWORD wiring + threadpool. The provenance guard only adopts/rotates a non-service row when it still holds a published default; admin is refused unconditionally.

Validation (on the merged tree): ruff clean; mypy = staging baseline; 172 auth/credential/startup/ws/migration tests pass; single alembic head v2_155; openapi + regenerated frontend types fresh (tsc clean); helm lint/template green (shipped-default changeme correctly fails the render guard); docker compose config green on all modes (backend + mcp both get MCP_SERVICE_PASSWORD); version/detector/sync self-tests green; commit-lint clean over the range.

Supersedes the seven individual PRs, which will be closed unmerged (branches + archive tags retained for history). Closes #192.

[mwiget]

Consolidation review — verified against the merged tree at b5a37aa

I checked out the integration branch and re-verified the consolidation rather than taking the description on trust. The merge itself is sound, and every validation claim in the PR body reproduces locally.

Fidelity — clean

• No file from any of the seven PRs is missing from the integration branch.
• #179 lands byte-identical (zero drift vs its own branch). The others drift only where they genuinely overlap.
• auth_service.py carries the full union of both credential surfaces (token_user_state, enforce_password_change, _rotate_known_default_admin, _persist_generated_password from #186; holds_known_default_password, disable_stale_service_user, is_service_account from #188).
• Exactly one test disappears vs #188 (test_seeded_admin_can_login) — #186 removes it too, correctly, since DEFAULT_ADMIN_PASSWORD is now None. Not a loss.

Reproduced locally

209 auth/credential/startup/ws/migration tests pass (you claimed 172) · ruff clean · shellcheck clean over all 43 tracked scripts · commit-lint clean · compute_version_bump (19 assertions), extract-breaking-changes (28), registry-tag-probe self-tests all pass · INV-15 detector parity holds (both functions byte-identical) · sync-version-artifacts.sh --check OK at 3.1.6 across all 5 artifacts · helm lint/template OK, and --set secrets.mcpPassword=changeme correctly fails the render · docker compose config OK on all three compose files.

CI is fully green — all 29 jobs, including Migration Upgrade From Released Version (Postgres), which validates v2_155's backfill on the real upgrade path (my local run only covered SQLite).

---

Requesting changes on three items

All three are cheap. Two are seams this consolidation created that no prior review round has seen; the third is a merge-mechanics trap that becomes unrecoverable once merged.

1. The merge commit needs a BREAKING CHANGE: footer — this must happen at merge time

On this branch, scripts/extract-breaking-changes.sh v3.1.6 HEAD emits only the container-runner entry. The squashed commit carries no footer, so the generated 4.0.0 release notes will omit:

• MCP_SERVICE_PASSWORD is now required — validate_production SystemExits the backend under ENVIRONMENT=staging|production when it is unset or a known default
• the shipped admin / changeme default is gone, and is actively overwritten on upgrade
• MCP_USERNAME / MCP_PASSWORD → MCP_SERVICE_USERNAME / MCP_SERVICE_PASSWORD in the dist bundle
• Helm secrets.mcpUsername: admin → mcp, mcpPassword: changeme → generated

CHANGELOG.md documents these, but the generator reads commit footers, not the changelog. A follow-up commit cannot fix this — the tag would already be cut from a footerless range. Please add a canonical column-0 BREAKING CHANGE: <text> footer to the squash-merge message; lint-commit-markers.sh explicitly allows that exact form.

Worth flagging given this stack is the release-notes tooling.

2. backend/core/config.py contradicts itself on the unset-password behaviour

3. Dead branches in ensure_service_user

See the inline comments.

---

Non-blocking — follow-ups, not merge blockers

Inline below. Two of these (disable_stale_service_user's misleading warning, the WS event-loop blocking) are inherited from already-approved branches, not introduced here — flagging for the backlog, not for this PR.

_{One retraction: I initially saw 2 test_kube_context_threading failures in a local full-suite run. CI's Unit Tests · Backend is green and this PR touches no kube files — that was a local artifact, not a finding.}

[mwiget]

Blocking — the two comment blocks on this setting contradict each other.

This block (from #186) says that when MCP_SERVICE_PASSWORD is unset, ensure_service_user "generates a random secret and surfaces it once". The #188 block ~17 lines below, on the same setting, says the opposite: "when unset the backend simply doesn't seed the account (MCP is unavailable until it's configured)".

#188's is the correct one. startup_steps.py gates the ensure_service_user call on _mcp_pw_usable, so the generation path is never taken from startup.

A reader has no way to tell which describes reality. Please drop or rewrite the #186 block.

Minor, same place: this block is about MCP_SERVICE_PASSWORD but sits above MCP_SERVICE_USERNAME, so it reads as documenting the wrong field.

[mwiget]

Blocking — the usable_password is None branches are unreachable in production.

seed_auth_step only calls ensure_service_user when _mcp_pw_usable is true, so password is never None and never a published default at runtime. That makes two documented paths dead:

• fresh row → generate + persist a secret
• existing row still holding a published default → rotate it out

Only tests reach them (test_auth_service.py:471,487,496,498,660,683), so coverage looks healthy while production never executes the code. The docstring above promises behaviour that cannot occur.

This has a user-visible consequence, not just a tidiness one: scripts/mcp_live_smoke.py now tells operators to read /app/keys/initial_mcp_password — a file _persist_generated_password(..., filename=f"initial_{username}_password") can never create.

Either delete the branches (and fix the docstring + the smoke-test hint), or route the unset case through them instead of short-circuiting in startup_steps. I'd lean toward deleting: #188's disable-stale is the deliberate choice for the unset case, per the integration note.

[mwiget]

Follows from the dead-branch comment on auth_service.py: /app/keys/initial_mcp_password is never written on any reachable path, so this hint sends operators to a file that will not exist. Same text repeats at line 232.

[mwiget]

Non-blocking. This duplicates MCP_KNOWN_DEFAULT_PASSWORDS in core/config.py — identical values, two definitions. They feed different guards: the config one drives validate_production, the startup usability gate and holds_known_default_password (the re-enable refusal); this one drives the adopt/rotate decisions here. If they ever drift, the re-enable guard and the rotation guard disagree about what counts as a published default.

Worth collapsing to one import. (Helm's $mcpDefaults is an unavoidable third copy and is already commented as needing lockstep.)

[mwiget]

Non-blocking, and inherited from #188 rather than introduced here — flagging for the backlog.

Two consequences of calling this unconditionally before the reconcile:

1. The warning below hardcodes "no usable MCP_SERVICE_PASSWORD is set", but it now fires on every boot including the healthy path where one is set and the reconcile re-activates the row moments later. Operators will see a credential warning on every restart of a correctly-configured stack.
2. The disable and the re-enable are two separately-committed transactions. On a rolling restart or with multiple api replicas, there is a window where the mcp account is inactive — in-flight MCP calls 401, and the new auth-probe healthcheck can flip the container unhealthy.

Both would be addressed by skipping rows about to be reconciled, or doing disable+reconcile in one transaction.

[mwiget]

Non-blocking, worth its own issue. DEFAULT_ADMIN_MUST_CHANGE is a new escape hatch out of #184's must-change gate, but validate_production() says nothing about it — while it does fail-fast on MCP_SERVICE_PASSWORD in the same method.

So ENVIRONMENT=production + DEFAULT_ADMIN_MUST_CHANGE=false + a chosen DEFAULT_ADMIN_PASSWORD seeds a permanently un-gated admin, and nothing objects. The comment here and in values.yaml both say "never set false on a real deployment" — the #182 lesson was that documentation is not enforcement. Adding it to the validate_production issues list would close it in one line.

[mwiget]

Non-blocking, inherited. token_user_state() opens a sync DB session and is awaited directly on the event-loop thread inside async def _validate_ws_token — the exact pattern auth_middleware.py wraps in run_in_threadpool after it was raised as a Major in #186 r5.

Handshake-only, so far lower traffic than the middleware path, but the two now handle the same call inconsistently. Same at dpus_websocket.py:65 and in benchmarks._agent_ws_authorized.

[mwiget]

Non-blocking. This heads-up still reads as if #186/#188 are pending — "That boot-time check ships in #188 — it is not in the 3.1.x line", and further down "sequenced to merge with or after #186 + #188" plus "#186 will conflict in user-pack/install-guide.html — resolve by taking #186's credential model".

In a tree where all three have landed together, that is stale merge-ordering guidance shipping in a user-facing changelog. The upgrade instructions themselves are correct and worth keeping — it's the forward-looking framing that needs a pass.

[mwiget]

Nit. This fallback branch (and the grep -q -- '--self-test' guard above it) exists for the pre-#179 tree. #179 is now in this same commit, so the warning path is dead and the condition always takes the true branch.

Same shape at Makefile:533, and three release.yml comment blocks still say "the fail-closed fix for that script lands with #179, which owns it — this PR does not touch scripts/extract-breaking-changes.sh". Worth a cleanup sweep now that the stack is one commit.

[jgruberf5]

Self-review — max-effort code review of the consolidated tree (@bonnyr-f5 @mwiget)

Ahead of your reviews, we ran an independent max-effort correctness pass focused on the auth/credential core (where the consolidation risk concentrates: auth_service.py, auth_middleware.py, config.py, startup_steps.py, routes/auth.py, benchmarks.py, the WS validators, and the v2_154/v2_155 migrations). Six findings; dispositions below. All of the "fixing" items are being applied in a single follow-up commit (with the required BREAKING CHANGE: footer per @mwiget's item 1).

Fixing now

CR-1 · HIGH · concurrent first-boot admin lockout — backend/services/auth_service.py (fresh-admin-seed path)
Fresh install, DEFAULT_ADMIN_PASSWORD unset, 2+ api replicas boot together: both see 0 users and each generates a different password. Replica A writes /app/keys/initial_admin_password=pwA and commits admin(pwA); replica B then O_TRUNC-overwrites the file =pwB and its create_user('admin') hits the unique-username IntegrityError and rolls back → file holds pwB, DB holds pwA → operator reads pwB and is permanently locked out (next boot users exist, _rotate_known_default_admin sees pwA which isn't a known default → no-op). The upgrade path is serialized with with_for_update(); the fresh-seed path was not. Fix: commit the row first, persist the keys file only after a successful commit, and on the losing replica's IntegrityError skip the file write entirely. New regression test.

CR-5 · security · 0600 only enforced on create — _persist_generated_password (auth_service.py:~254)
os.open(..., O_CREAT|O_TRUNC, 0o600) applies 0600 only when the file is newly created; a pre-existing 0644 file (older release) is truncated in place but keeps 0644, so the generated secret is written world-readable — contradicting the docstring. Fix: explicit os.fchmod(fd, 0o600) after open; test with a pre-created 0644 file.

CR-2 · consistency · WS validators block the event loop (also raised by @mwiget)
k8s_websocket.py:~50, dpus_websocket.py:~65, benchmarks.py _agent_ws_authorized:~1524 call the blocking sync token_user_state() directly on the event loop — the exact stall the middleware fixed via await run_in_threadpool(...). Fix: wrap identically in the three WS paths.

Triaged out (with reasons — not fixing in #193)

CR-4 · is_root_user rejects named-nonroot (USER nonroot, uid 65532) — container_runner.py:~587. Real behavioral change, but it is the #2 container-hardening decision that pre-dates this series (already in staging/main), deliberately made to align with k8s runAsNonRoot. Out of scope for this consolidation.

CR-3 · disable_stale_service_user disables all service accounts; reconcile re-activates one — startup_steps.py:~255. Bounded: exactly one service account (mcp) exists today, so no row is stranded. Leaving a code comment noting the multi-service-account limitation; a redesign is a follow-up, not a merge blocker. (Also flagged non-blocking by @mwiget.)

CR-6 · per-request token_user_state DB round-trip in the middleware — auth_middleware.py:~178. A necessary tradeoff: the password-change gate requires the resolved user on every authenticated request. Moved off the event loop already; further optimization (caching) is a follow-up, not a correctness issue.

---

Combined with @mwiget's three blockers (release-notes footer, the config.py unset-behavior comment, and the dead usable_password is None branches in ensure_service_user), all of the above land in one validated commit. CR-1 is the notable one — a fresh cross-cutting pass over the consolidated auth path surfaced a concurrency lockout that the per-PR rounds didn't, which is exactly why consolidating and re-reviewing the merged tree (per #192) was worth doing.

[mwiget]

Thanks — CR-1 and CR-5 are both real and both things my pass missed. I verified them against the tree: on CR-1 I'd read the with_for_update() locking on the upgrade path, noted it as careful, and never asked whether the fresh-seed path had the same protection. It doesn't. Good catch, and it's the strongest argument yet for #192's consolidate-then-re-review premise.

Two notes before you cut the follow-up commit.

CR-1 — make sure the guard covers ConflictError, not just IntegrityError

Your description says "on the losing replica's IntegrityError skip the file write". On the common path the loser won't raise IntegrityError — create_user does an explicit pre-check first:

if db.query(User).filter(User.username == username).first():
    raise ConflictError("user", f"Username '{username}' already exists")

so the loser raises ConflictError. IntegrityError only surfaces in the narrower window where both replicas clear the pre-check and then race to flush. If the guard catches only IntegrityError, the ordinary case still clobbers the file.

Your primary fix — commit first, persist only after a successful commit — makes this moot, since the loser never reaches the write on any exception path. Just flagging it in case the implementation leans on the exception catch rather than the reordering, since only the reordering is exception-type-agnostic.

CR-3 — the triage answers a different question than the one I raised

"Bounded: exactly one service account (mcp) exists today, so no row is stranded" addresses multi-service-account stranding. That wasn't my finding. Mine were two things that hold with exactly one service account:

1. The warning fires on every boot of a correctly-configured stack. disable_stale_service_user now runs unconditionally before the reconcile, and its message hardcodes "no usable MCP_SERVICE_PASSWORD is set". With a strong password set and the reconcile re-activating the row moments later, operators still get a credential warning on every single restart. That's a false alarm in the logs on the healthy path — and it trains people to ignore the one message that matters when the password genuinely isn't set.

2. Disable and re-enable are two separately-committed transactions. seed_auth_step commits the disable in one get_db_context() block, then re-activates in another. On a rolling restart or with multiple api replicas, there's a window where mcp is inactive: in-flight MCP calls 401, and the new auth-probe healthcheck (python -m bnk_forge_mcp.healthcheck) can flip the container unhealthy on a stack where nothing is actually misconfigured.

Both are still non-blocking from my side — I'm not asking you to redesign this in #193. But if the disposition is "defer", the reason on record should be that these are acceptable for now, not that a single service account makes them not-apply. A cheap partial fix if you want one while you're in the file: skip the warning for the row that's about to be reconciled, which kills (1) without touching the transaction structure.

Everything else in your triage I agree with. CR-4 is correctly out of scope — I confirmed #193 changes only the docstring and the error-message text in container_runner.py; the is_root_user behaviour predates this series and is already on staging. CR-6 reads as a reasonable tradeoff, not a defect.

Ping me when the follow-up lands and I'll re-review. One thing that won't be re-verifiable from the branch: the BREAKING CHANGE: footer goes in the squash-merge message, so it needs confirming at the moment of merge rather than in a re-review of the commits.

[jgruberf5]

@mwiget — all three blockers addressed in d4d00110, plus the three actionable findings from the self-review above. Thanks for the careful consolidation check.

Your blockers:

1. BREAKING CHANGE: footer — added as a canonical column-0 footer on the fix commit, so it's in the v3.1.6..HEAD range. Verified: extract-breaking-changes.sh v3.1.6 HEAD now emits the full 4.0.0 entry (MCP_SERVICE_PASSWORD required; admin/changeme removed + rotated on upgrade; MCP_USERNAME/MCP_PASSWORD → MCP_SERVICE_* in dist; Helm mcpUsername=mcp + generated mcpPassword). Commit-lint accepts it (green).
2. config.py unset-behavior comment — rewritten to the true merged behavior (unset → disable_stale_service_user leaves the mcp account disabled until a real password is set; published default refused + rotated; backend receives MCP_SERVICE_PASSWORD on every deploy mode). Removed the stray duplicate block.
3. Dead usable_password is None branches — removed from ensure_service_user (the generate-on-create and rotate-on-unset paths were unreachable via seed_auth_step); the function now requires a usable password, "unset → disabled" is owned solely by disable_stale_service_user. Updated the unit tests accordingly and fixed the mcp_live_smoke.py hint that pointed at a never-written file.

Self-review finds also fixed: CR-1 (fresh-boot admin-lockout race — commit-then-persist + IntegrityError guard, regression test added), CR-5 (_persist_generated_password now fchmods 0600 so a pre-existing 0644 file is tightened), CR-2 (WS validators' token_user_state moved off the event loop in the three paths).

344 tests pass; ruff/mypy clean; helm + docker-compose green; self-tests green. Re-requesting review.

[mwiget]

Re-review of d4d0011 — all three blockers resolved, approving

Verified against the tree rather than the commit message. CI is green on the new head: 29/29 jobs, zero non-success.

Blockers — closed

1 · BREAKING CHANGE: footer — closed, and verified at the point that actually matters.

extract-breaking-changes.sh v3.1.6 HEAD now emits the MCP entry alongside the container-runner one. More importantly, I simulated the squash-merge composition rather than just checking the branch, since that was the part a normal re-review can't reach:

• this repo's squash_merge_commit_message is COMMIT_MESSAGES, so the squash body concatenates both commit bodies with only the subjects bullet-prefixed
• I rebuilt that exact message shape and re-ran the detector against it — the footer stays at column 0, survives the composition, and is extracted correctly

So the 4.0.0 notes will carry it. One thing to protect: if anyone ever flips that repo setting to PR_BODY or BLANK, this silently regresses. Worth knowing.

2 · config.py contradiction — closed. One coherent block on the correct field, and it now states the merged reality: unset (or a published default) → seed_auth_step skips ensure_service_user and disable_stale_service_user leaves the account disabled; no generation, nothing surfaced.

3 · Dead branches — closed, and better than I asked for. The unreachable generate/rotate-on-unset paths are gone, _log_generated_service_password with them, and you added a fail-closed ValueError if the function is ever handed an unusable password — so the contract is now enforced rather than merely documented. mcp_live_smoke.py no longer points operators at a file nothing writes.

Your own findings — verified

CR-1 — I checked the reordering, not just the description. create_user + flush now runs first inside try, the keys file is written only after winning the race and before commit, and the handler catches both IntegrityError and ConflictError. That second one is what I flagged: the loser hits create_user's explicit pre-check (ConflictError) on the common path, and IntegrityError only in the narrower both-clear-the-pre-check window. Both are covered, so the file can only ever hold the committed row's password. The GeneratedCredentialPersistError → db.rollback() path also correctly keeps the fail-closed-with-nothing-committed property from #186.

CR-5 — os.fchmod(fd, 0o600) lands after os.open but before the write, and O_TRUNC has already emptied the file by then, so there's no window where a populated secret sits at 0644. Correct fix, correct ordering.

CR-2 — all three call sites moved off the event loop, including benchmarks.agent_websocket, which I'd named but not anchored. Wrapping the whole sync _agent_ws_authorized helper rather than just token_user_state is the right call there.

Local: ruff clean; 228 auth/credential/startup/ws/migration tests pass (up from 209); commit-lint clean over the 2-commit range; version derivation still resolves major → 4.0.0.

---

Non-blocking — for the follow-up, not this PR

CR-3's note is still scoped to the wrong thing. The new docstring says the momentary inactive window would matter "if more service accounts are ever added". Both issues I raised happen today, with exactly one account:

• disable_stale_service_user commits the deactivate in one get_db_context() block and ensure_service_user re-activates in a separate one — so the single mcp row genuinely is inactive between those two commits on every boot
• the warning still reads "no usable MCP_SERVICE_PASSWORD is set" and fires on every restart of a correctly-configured stack

Genuinely fine to defer — I'm not asking you to change behaviour here. But the note as written would lead the next reader to conclude there's nothing to fix until a second service account appears, and that's not right. A sentence correcting the scope costs nothing.

CR-1's test covers only IntegrityError. The code handles both, but test_losing_replica_does_not_clobber_keys_file monkeypatches create_user to raise IntegrityError only — leaving the more common ConflictError path unexercised. A parametrize over the two would pin the fix as written.

Carried over, unchanged and still fine to defer: the duplicated default-password tuples (config.py:21 / auth_service.py:225), DEFAULT_ADMIN_MUST_CHANGE still absent from validate_production, the stale forward-looking CHANGELOG framing, and the dead "#179 hasn't landed yet" guards in ci.yml / Makefile / release.yml comments.

---

Approving. The consolidation was already sound; what this round added is a concurrency lockout and a file-mode leak that neither the per-PR rounds nor my first pass caught — which is the case for #192's approach made in full.

One request at merge time: squash-merge (the footer depends on it) and don't hand-edit the composed message.

[bonnyr-f5]

Review: PR #193 — integration of the #177 follow-up stack

Verdict: BLOCK — 6 blockers, 8 majors. Audited at d4d0011.

Method note, because it shapes everything below. This branch is a squashed re-application, not a merge: two flat commits on 4a52ed4, and none of the seven PR heads is an ancestor. So every conflict resolution is invisible in the history and was never seen by any reviewer. I rebuilt the reference sequential merge in #192's order and diffed it against this tree to recover that surface — 24 files, ~1,771 lines of hand-resolution. Three of the six blockers live in it.

Credit where it is due: this is a careful integration. helm/templates/secrets.yaml is an exemplary three-way resolution (both PRs' guards combined, #188's rotate correctly routed through #186's nil-safe $data map). backend/core/config.py and startup_steps.py are clean unions. INV-13 passes outright — index $existing is gone, every key read is hasKey-guarded, and the nil-.data fold additionally covers a stringData-only Secret. _helpers.tpl's adminMustChange nil-vs-false handling correctly avoids the sprig default trap it documents. And the two hardest round-5 reachability defects are genuinely closed and proven by execution: the backend now receives MCP_SERVICE_PASSWORD on all six deploy channels, and the provenance-keyed disable runs unconditionally so the diligent operator is covered.

Verified author claims: single alembic head v2_155 (154 revisions, no dangling down_revision) ✅ · ruff check clean ✅ · 228 auth/credential/startup/ws/migration tests pass, 0 failures — the body's "172" undercounts ✅ · no conflict markers leaked ✅ · no source PR's changes wholly reverted ✅

---

Blockers

B1 · ensure_service_user adopts any human account whose password is changeme

backend/services/auth_service.py:558-570

#188's guard was deliberately keyed on provenance, not name — its own comment: "a name collision must never take over a human account. Gate on provenance, not the username." This integration adds an exception: a non-service row is adopted anyway if it authenticates with a known default. But _KNOWN_DEFAULT_SERVICE_PASSWORDS (:225) is ("mcp-service-changeme", "changeme"), and _RESERVED_HUMAN_USERNAMES (:237) is only {"admin"}. changeme is not a service-account fingerprint — it is one of the most common human passwords in existence.

This is new in the integration. Round-5 #188 raised unconditionally on not user.is_service_account.

Reproduced (component fixture, MCP_SERVICE_USERNAME=operator):

row: operator / ops@corp.example / "changeme", role=admin,
     is_service_account=False, must_change_password=True
-> is_service_account   = True
-> must_change_password = False      # security gate CLEARED
-> is_active            = True
-> MCP shared secret authenticates as 'operator'  = True
-> the human's own password still works           = False   # takeover + lockout
control: same row with a real password -> correctly REFUSED

So the bypass is keyed purely on the password value. Note must_change_password=False also defeats #186's own gate on that account, and the reconcile block's comment at :576 claims "we do NOT widen privilege on reconcile" while exempting only role.

It also breaks a premise another function depends on. disable_stale_service_user (:590-635) deactivates every is_service_account row, and its docstring asserts the flag "is set only on rows this seeder created, never on a human account, so disabling all service accounts can never touch a human login." After an adoption that is false: the adopted human login is deactivated on any later boot where MCP_SERVICE_USERNAME no longer names it.

The bypass also looks unnecessary. v2_155 already backfills the legitimate case, and its docstring explains why it deliberately goes no further — it matches username='mcp' AND email='mcp@bnk-forge.local' specifically so "a real human who merely happens to be named mcp (with any real email) is left untouched", because "silently reclassifying an operator-named row we cannot prove we created risks taking over a human account." That reasoning is right; the password-valued bypass re-introduces exactly what it avoided.

Fix: scope the exception to v2_155's username+email fingerprint, or drop it. Do not clear must_change_password on an adopted row. A new test (test_adopts_and_reconciles_a_legacy_row_holding_a_published_default) currently encodes this behaviour as intended — it needs to change with the code.

B2 · The dist tarball's only MCP instruction names a variable nothing reads

dist/README.md:34 — added by this diff

It is the sole MCP row in the "Required settings in .env" table and it names MCP_PASSWORD. The same diff deleted the last consumers: on staging, dist/docker-compose.yml read ${MCP_USERNAME:-admin} / ${MCP_PASSWORD:-changeme}; here it reads ${MCP_SERVICE_USERNAME:-mcp} / ${MCP_SERVICE_PASSWORD:-}.

git grep -nE 'MCP_(USERNAME|PASSWORD)' -- dist/ now hits only that README line. Executed in a scratch copy of dist/ with MCP_PASSWORD=<strong> in .env:

$ docker compose config
  backend:  MCP_SERVICE_PASSWORD: ""
  mcp:      BNK_FORGE_PASSWORD:   ""

The operator follows the README, _mcp_pw_usable stays false, disable_stale_service_user runs, ensure_service_user never does, and MCP is permanently dead with no log line naming the variable they set. Three files ship in one tarball with two different names, one of them inert (dist/.env.example:43 and user-pack/install-guide.html:183 both say MCP_SERVICE_PASSWORD).

This is INV-17 recurring — an invariant whose Origin line is this same series.

Same class, developer-facing (majors, not blockers): mcp-server/README.md:62,108, Makefile:602,626, docs/E2E-CRITICAL-004_MCP_SANITY.md:90 (lists MCP_USERNAME as Required). Note scripts/mcp_live_smoke.py:147,233 was correctly migrated in this same diff — so the script's hints were updated and the README/Makefile describing the same procedure were not.

Fix: either accept the compat alias — MCP_SERVICE_PASSWORD: ${MCP_SERVICE_PASSWORD:-${MCP_PASSWORD:-}} plus the username equivalent, which also fixes B2b below — or complete the rename across all five sites and release-note it as a break.

B2b · the dropped alias is itself an upgrade break

#188 made an explicit, commented decision to keep the short names in the shipped package (pr188-head:dist/.env.example:36-41): "the dist package keeps the shorter MCP_USERNAME/MCP_PASSWORD names … so existing customer .env files keep working." origin/staging:dist/.env.example really does ship MCP_USERNAME=admin / MCP_PASSWORD=changeme, so deployed customer .env files carry those names today. dist/install.sh:78 preserves an existing .env. After upgrade, a customer who had set a strong MCP_PASSWORD has it silently ignored. Fails closed, so no security hole — but it is a silent functional regression that #188's reviewer specifically approved protection against.

B3 · The flagship MCP fail-fast is unreachable on every shipped path

backend/core/config.py:242-248, gated by :225

The new guard refusing an unset or known-default MCP_SERVICE_PASSWORD sits behind if self.ENVIRONMENT not in ("staging","production"): return.

ENVIRONMENT reaches no container on any shipped path: grep across docker-compose.yml, .local, .adr424, dist/docker-compose*.yml, scripts/ibm_cloud_bnk_forge.sh and vm-bnk-forge/ returns nothing; there is no env_file: and no .env bind mount anywhere; class Config (:189-191) declares none. So ENVIRONMENT is always development on every Compose/dist/IBM/VM deployment and the guard returns at :225. Helm is the only path that sets ENVIRONMENT=production — and there secrets.yaml:57-77 guarantees mcp-password is never empty and never a known default, so it cannot fire there either.

The guard fires for no shipped population. Meanwhile CHANGELOG.md:24-33 and user-pack/install-guide.html:336-340 tell operators the backend "refuses to boot" / "SystemExits the stack" without it. The actual behaviour is a logger.warning at startup_steps.py:274-277 and a silently disabled account.

What makes this a blocker rather than a doc nit: the compose files themselves comment "config.py has no env_file, so an unpassed var never reaches the container" (docker-compose.yml:22,33; dist:36) — the constraint was known — while .env.example:64-70 still presents ENVIRONMENT as a working knob that "enforce[s] security key validation at startup."

Fix: plumb ENVIRONMENT: ${ENVIRONMENT:-development} into the backend-env anchors, or move the MCP check out of the ENVIRONMENT-gated block. dist/.env.example:37-39 honestly admits the guard is skipped — that is an admission, not a mitigation.

B4 · The immutable-tag probe inverts its verdict on BSD sed, and its error text routes the operator into the override that disables it

scripts/registry-tag-probe.sh:92

The token parse uses \| alternation in a BRE — a GNU extension. Executed on macOS (/usr/bin/sed):

$ printf '{"token":"T1","access_token":"T2"}' \
  | sed -n 's/.*"\(access_token\|token\)"[[:space:]]*:[[:space:]]*"\([^"]*\)".*/\2/p'
(empty)

$ ... | sed -nE 's/.*"(access_token|token)"[[:space:]]*:[[:space:]]*"([^"]*)".*/\2/p'
T2

So _fetch_token returns empty, _manifest_status stays 401, and every image classifies unknown. Makefile:1261-1286 then refuses and prints "…or re-run with FORCE_LATEST=1 to override deliberately." Exporting registry credentials does not help — the token body still cannot be parsed. FORCE_LATEST=1 skips the existence probe entirely (Makefile:1261), so bake overwrites the already-published immutable :VERSION manifests and orphans their cosign/SBOM/SLSA attestations — precisely the INV-24 harm the probe exists to prevent, reached by following the probe's own remediation. The Makefile branches on ifeq ($(UNAME_S),Darwin), so macOS is a supported operator platform.

Fix: sed -nE (verified portable), or parse with python3/jq. No GNU-only regex in scripts that run on both CI and operator machines.

B5 · That probe's only test is wired to nothing, and it is red today

scripts/tests/registry-tag-probe.test.sh — new, 104 lines

$ grep -rn "scripts/tests" Makefile .github/workflows/ .githooks/
(no callers anywhere)

$ bash scripts/tests/registry-tag-probe.test.sh   # true rc, not through a pipe
FAIL  absent -> publish            -> got UNKNOWN want SAFE
FAIL  nonexistent-repo -> publish  -> got UNKNOWN want SAFE
FAIL  exists -> refuse             -> got UNKNOWN want EXISTS
... 6 PASS ...
FAILURES
rc=1

make shellcheck lints it (it is in the git ls-files '*.sh' set) but nothing runs it — not ci-gates, not script-selftests (Makefile:518-537), not ci.yml's script-selftests job, not .githooks/pre-push. It fails closed correctly and it detects B4 precisely. A mutation suite written to prove the four INV-24 outcomes is dead code that would have caught B4 on the machine it was written on.

Fix: enumerate scripts/tests/*.test.sh from the filesystem in both the Makefile target and the ci.yml job, and fail on an empty enumeration.

B6 · The commit-lint exemption is spoofable, and the actual unlinted input is the PR title

scripts/lint-commit-markers.sh:105-109

Round-5 #182 BLOCKER-1 is genuinely fixed — the exemption fires on 4a52ed4 and the promotion range is green. But the predicate is committer == "GitHub <noreply@github.com>" && nparents == 1, and the comment at :103 asserts "This is an identity check on the committer, not a spoofable subject allowlist." Committer identity is set by the committing client:

# identical bodies containing [skip ci]
human commit                                         -> rc=1 (caught)
git -c user.name=GitHub -c user.email=noreply@github.com commit -> rc=0 "exempt"

The comment at :88-91 also states GitHub composes the squash body from the PR description. For this repo gh api returns squash_message: COMMIT_MESSAGES and squash_title: COMMIT_OR_PR_TITLE — the body is the concatenated commit messages (which are linted pre-merge), and for any PR with ≥2 commits the subject is the PR title, which is linted nowhere. Executed:

squash-shaped commit, subject "fix: tidy the runner [skip ci]", clean body
-> "is a GitHub-composed squash commit … -- exempt"   rc=0

GitHub then suppresses the workflow run for that push — and the gates skipped are ShellCheck, Secret Scan and Script Self-Tests, which this script's own header calls "exactly the ones that matter." 43 of 44 GitHub-committer commits in this repo's history are single-parent, so essentially all of mainline is exempt.

Fix: lint the PR title in the pull_request event (that is the unlinted vector), and key the exemption on a property the client cannot set — e.g. "this SHA is already reachable from origin/main/origin/staging", which is the "already-merged, unamendable" property the comment actually wants. Also split the rules: exempting machine identities is right for the marker rule and wrong for the spurious-major rule, since a blank-line-anchored BREAKING CHANGE bullet in a squash body majors the next release with no gate anywhere.

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Majors

M1 · #186's "MCP always comes up with a retrievable generated secret" guarantee was removed — needs explicit sign-off, not a silent merge. The two PRs shipped incompatible answers for an unset MCP_SERVICE_PASSWORD: #186 generated and persisted one; #188 left MCP disabled. The integration takes #188 and deletes #186's path (_log_generated_service_password gone, ensure_service_user now hard-refuses). The choice is defensible and is documented in-tree, and #186's model arguably cannot work for a secret the MCP client must also hold — but #186's reviewers approved the other guarantee and six of its tests went with it. This is a decision for you and the #186 reviewer, not a review finding.

M2 · False warning on every boot, plus a committed inactive window. startup_steps.py:250-251 commits the disable in its own get_db_context, then reconciles in a separate one (:262-267). On a correctly-configured install the row is disabled-and-committed then re-activated, so auth_service.py:628 logs "no usable MCP_SERVICE_PASSWORD is set" on every boot of every correct install — training operators to ignore the one case where it is true. The inactive state is committed and visible to other replicas, so a rolling restart can 401 live MCP traffic for a bcrypt-plus-commit window. Fix: skip the row about to be reconciled, or do both in one transaction; make the message conditional on _mcp_pw_usable.

M3 · The GHCR overwrite guard fails open when the probe cannot run at all. release.yml:1109-1139 derives its vacuity floor IMAGES_N from the same script it is guarding, so when the script is unavailable both counts are 0, 0 -ne 0 is false, nothing is classified, and the step reports success — then bake --push runs unguarded. Executed with the probe path pointed at a missing file: IMAGES_N=[0] PROBE_N=[0] → "safe to publish" → rc=0. Reachable by moving the script without updating the sparse-checkout list at :967-969, which matches silently. Makefile:1263 gets this right, so the hardened CI path is the fail-open one. Fix: derive the count from an independent source (a literal, or docker-bake.hcl's group) and assert the probe's exit status before using its output.

M4 · INV-31: fail-closed steps sit after two irreversible pushes. In release-final: git push origin main (:699) and git push origin vX.Y.Z (:700), then release-notes generation with no || true (:724), then gh release create (:749), then the recency re-check (:1009-1068, exit 1) and the already-published-tag refusal (:1070-1146, exit 1). A failure at :724 leaves main bumped and the tag pushed with no Release and no images — and recovery is awkward by construction, since main's head is now release: vX.Y.Z [skip ci], which :249-252 refuses to poll and :409-417 refuses because the tag exists. registry-tag-probe.sh:13-15 acknowledges this shape in its own header. Fix: hoist every non-registry precondition into preflight and the registry probe into a pre-push job.

M5 · make script-selftests is strictly narrower than the CI job it claims to mirror. ci.yml's job has two steps — the compute self-test and an INV-15 detector-parity diff (:244-299). The Makefile target has only the first (grep -n "INV-15\|_is_breaking\|parity" Makefile → nothing). Makefile:476-484 asserts "These targets ARE the CI command"; that is false for the parity gate, so local detector drift passes make pre-push and only surfaces in CI.

M6 · The extractor self-test is gated on a grep of its own subject. Makefile:536 / ci.yml:295: if grep -q -- '--self-test' scripts/extract-breaking-changes.sh … else warn and pass. The code under test decides whether it is tested — deleting the flag silences ~28 assertions and the gate stays green (executed). The compute side has four anti-vacuity assertions (exit code, PASS lines, END marker); the extractor side has none and trusts the exit code alone. Its compute-side siblings correctly go red under the same harness breaks, so the asymmetry is in the gate, not the technique. INV-16.

M7 · Helm: the new auth-probe healthcheck never reaches Kubernetes. mcp.yaml:66-75 probes tcpSocket: 8081 only, while all four compose paths run python -m bnk_forge_mcp.healthcheck. The comment added at dist/docker-compose.yml:379-383 claims "the 'no creds -> unhealthy' signal fires on the shipped path too" — Helm and the IBM installer are also shipped paths and get nothing. The binary is in the image; the chart never invokes it. This matters most because it is the one signal that would surface M8.

M8 · Helm: mcpUsername: admin was the shipped default, and this diff is what makes it bite. origin/staging:helm/values.yaml:28-29 ships mcpUsername: admin, and on staging those keys reached only the mcp pod. This diff newly plumbs mcp-username → MCP_SERVICE_USERNAME onto api/worker/beat (_helpers.tpl:125-129). For any GitOps repo that pinned the shipped default: the unconditional disable deactivates the legitimate mcp row, ensure_service_user then raises the reserved-name refusal (correct, and non-fatal), nothing re-enables the row, and MCP is permanently down while helm upgrade reports success. The chart fails loudly for a shipped-default mcpPassword (secrets.yaml:76) but has no equivalent guard for mcpUsername, and NOTES.txt never mentions it. Fix: mirror the fail for a reserved mcpUsername.

---

Minors / nits

• helm template renders four mutually inconsistent checksum/secret values. api.yaml:36, mcp.yaml:37, worker.yaml:20, beat.yaml:22 each include secrets.yaml, re-executing it and re-rolling randAlphaNum. Two consecutive renders of the unchanged chart gave four different checksums each time; pinning every secrets.* value collapses them to one stable hash. Cosmetic on Helm (an extra roll on the next upgrade). Plausible but unverified — no Argo available: a helm template-based GitOps controller has no lookup, so admin-password would regenerate every sync, breaking the retrieval path NOTES.txt:21-22 documents.
• Duplicate version-check: target. Makefile:485 and :767; make warns "overriding commands for target" on every invocation in this repo. Both recipes are identical today, so behaviour is unaffected — but the first is silently discarded, so any future divergence is invisible. Also listed twice in .PHONY.
• Stale cross-PR sequencing comments (this is a squash-merge hazard worth a sweep). release.yml:604-611 and :716-723 assert "this PR does not touch scripts/extract-breaking-changes.sh" and that the script "still ends its own range query with || true (line 33)"; Fix non-deterministic version derivation (SIGPIPE race) — PR #177 Blocker 1 #179's 274-line rewrite of that exact script is in this tree and there is no || true there. Conversely extract-breaking-changes.sh:266-270 says "Merge Fix non-deterministic version derivation (SIGPIPE race) — PR #177 Blocker 1 #179 WITH or AFTER Release workflow: republish recovery path + RC/loop-guard robustness — PR #177 Blocker 3 #181 so this guard actually [fires]" — that already happened. A reader auditing whether release notes can silently go empty is told by both files that the guard is inert. (The mechanism itself is fine — see verified-clean below.)
• _persist_generated_password's docstring still claims the filename parameter "keeps the admin and mcp secrets in distinct files"; it is now only ever called with the default, so the parameter is vestigial.
• scripts/ibm_cloud_bnk_forge.sh retains Stop shipping a default admin credential; generate it and enforce rotation #186's rationale "otherwise the backend generates its own secret and the mcp client can never authenticate" — false under the merged model, which generates nothing for MCP.
• scripts/mcp_live_smoke.py new hints are attributed (#186/#188); Stop shipping the MCP service default credential; make Helm use the mcp account #188 never touched that file.
• scripts/e2e/config.py:184 still defaults bnk_forge_admin_password to "changeme", which can no longer authenticate anywhere; the diff updated the neighbouring docstring at steps.py:171-176 but not the value.
• .env.example:94 warns that an inline comment would become part of the password. Falsified for the common case: MCP_SERVICE_PASSWORD=s3cret # comment delivers s3cret. Only the no-whitespace form behaves as warned.
• .env.example:73 header still says "dev defaults shown"; this diff deleted them. :58 says set HOST_REPO_PATH in docker-compose.yml; it is read from .env.
• Three different recommended BNK_FORGE_VERSION values ship in one tarball: latest (dist/.env.example:19), 3.1.6 (dist/docker-compose.yml:23), 3.1.6 (dist/README.md:32).
• Makefile:431 unconditionally prints "Recommended next step: make mcp-readiness", which cannot pass on a default install now that MCP_SERVICE_PASSWORD ships unset.
• e2e-tests.yml:71 — if: github.event_name != 'schedule' || true is unconditionally true; dead condition.
• release.yml:685/:860 — git add dist/VERSION || true swallows a failing git add. :708-710 — on a repo with one final tag, tail -2 | head -1 returns the tag just created, so the first-ever release's notes render empty.
• CHANGELOG insertion is fail-open: release.yml:641-651 inserts after the first ^---$ and otherwise passes every line through with rc 0 (executed: entry silently dropped, step green). Latent — the anchor exists today. Assert the output differs from the input before committing.
• .trivyignore — exp: is honoured by the pinned Trivy 0.62.1, so a typo'd date is a silent suppression regression with no test. CVE-2026-7598 exp:2026-09-12 lapses in three weeks.
• make pre-push now hard-requires a running Docker daemon (ci-gates → secret-scan → docker run … gitleaks), so every push on a machine without Docker up fails at the hook. It fails loudly, which is right, but the hook's guidance does not mention the new dependency.
• Pre-existing, but inconsistent with this PR's own thesis: dist/.env.example:20,25 ship POSTGRES_PASSWORD=bnkforge_dev_password / REDIS_PASSWORD=bnkforge_redis_dev while both services run network_mode: host in the dist package — a published credential on 0.0.0.0 unless the operator edits .env, with nothing enforcing it. Exactly the hazard class this PR removes for admin/mcp.

---

Round-5 items now closed (please don't re-do these)

Confirmed by falsification, not by reading:

• Sync Helm chart tag / appVersion / package.json with VERSION — PR #177 Blocker 2 #180 INV-19/INV-29 check/write symmetry — FIXED. Both paths now use the same range expression (sync-version-artifacts.sh:65) and agree on all six boundary inputs, including the column-0 comment inside image: that broke r5; both now fail closed with matching messages.
• Fix non-deterministic version derivation (SIGPIPE race) — PR #177 Blocker 1 #179 F3 — FIXED. extract-breaking-changes.sh:259-275 fails closed (exit 1) on an unresolvable range and all three call sites dropped their || true; under Actions' bash -e the rc propagates.
• Fix non-deterministic version derivation (SIGPIPE race) — PR #177 Blocker 1 #179 INV-15/INV-21/INV-27 — FIXED. _is_breaking_subject/_is_breaking_body are byte-identical across both scripts, the CI parity gate goes red on injected drift, and the two agreed on all eight constructed divergences. Neither uses --first-parent.
• Wire gitleaks / shellcheck / script self-test CI gates — PR #177 Major #182 BLOCKER-1 — FIXED. The gate no longer rejects 4a52ed4. (See B6 for the new issue in the fix.)
• Wire gitleaks / shellcheck / script self-test CI gates — PR #177 Major #182 INV-22 — FIXED. The .gitleaks.toml rewrite is rule-scoped with no top-level [allowlist].paths; a planted key was caught in four sibling files and suppressed only in the intended one.
• INV-14 coupled workflows — HOLDS. ci.yml has no paths-ignore while release.yml does, so the polled workflow runs on a strict superset; cancel-in-progress: false on main/staging.
• INV-28 self-wedging — HOLDS. No new gate rejects any commit the automation creates.
• INV-10/INV-20 — FIXED. All five token_user_state call sites refuse on None (auth_middleware.py:190, benchmarks.py:140 and :1523, k8s_websocket.py:56, dpus_websocket.py:71) — including benchmarks.py, where this class previously recurred inside its own fix.
• Stop shipping a default admin credential; generate it and enforce rotation #186 BLOCKER-2, Fix registry/cosign/upgrade metadata + USER-gate authoring guide — PR #177 Majors #183 F2/F3/F4, CROSS-1/3/4/7, INV-7, INV-25/v2_155 backfill, INV-26 admin rotation — FIXED, each verified by execution or render.

---

Merge-resolution notes

Six #186 tests were dropped as collateral of M1's decision, all exercising the deleted generate-on-unset path: test_none_password_seeds_generated_secret, test_published_default_seed_cannot_authenticate, test_upgrade_rotates_existing_published_default, test_generated_secret_not_churned_on_reboot, test_service_seed_fails_closed_no_leak, test_service_rotate_fails_closed_no_leak. The last two asserted via a caplog sentinel scan that an unwritable keys dir never leaks plaintext; the admin equivalents survive, so that invariant is still covered for the admin path only. #188's test_seeded_admin_can_login is genuinely replaced by test_seeded_admin_can_login_with_explicit_password.

Two unreviewed changes that are improvements and should stay: os.fchmod(fd, 0o600) in _persist_generated_password (closes a real gap — os.open's mode applies only on create, so a pre-existing 0644 file would be truncated in place and keep its loose mode), and the inverted create/persist ordering in seed_admin_user with except (IntegrityError, ConflictError), which closes a concurrent-fresh-boot race where a losing replica clobbered the keys file. Both reverse a reviewed decision; both are better. run_in_threadpool in the three route files is correct and consistent with the existing middleware precedent. user-pack/install-guide.html gained ~40 lines of customer-facing security prose present in neither source PR — every factual claim checks out against the merged code and leaving #183's text would have shipped a false security alarm, so the rewrite was necessary; it simply has never been reviewed.

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Review Assessment

• Verdict: BLOCK
• Audit SHA: d4d00110ef164b0561aa2574a33a1426ea7c4fda
• Cold Audit Performed: Yes — three independent cold audits (credential, release/CI, deploy/docs) plus a merge-fidelity audit against a reconstructed reference merge, none given prior findings or author claims
• Invariants Verified: INV-4, INV-7, INV-9, INV-10, INV-11, INV-12, INV-13, INV-14, INV-15, INV-16, INV-17, INV-18, INV-19, INV-20, INV-21, INV-22, INV-23, INV-24, INV-25, INV-26, INV-27, INV-28, INV-29, INV-30, INV-31
• Git & Harness Cleanliness: Clean

Findings & Action Items

• Major (Blockers):
  • backend/services/auth_service.py:558-570: published-default bypass adopts any human row whose password is changeme — takeover, lockout, and must_change_password cleared; also breaks disable_stale_service_user's documented premise. Key the exception on v2_155's username+email fingerprint, or drop it
  • dist/README.md:34: the tarball's only MCP instruction names MCP_PASSWORD, which nothing reads; restore the alias or complete the rename across all five sites
  • backend/core/config.py:242-248: fail-fast unreachable — ENVIRONMENT reaches no container on any shipped path, while three docs promise a refusal to boot
  • scripts/registry-tag-probe.sh:92: GNU-only \| BRE inverts the verdict on BSD sed; the failure text routes the operator into FORCE_LATEST=1, which disables the guard
  • scripts/tests/registry-tag-probe.test.sh: no callers anywhere and red today; it detects the blocker above
  • scripts/lint-commit-markers.sh:105-109: exemption keyed on a spoofable committer string, and the real unlinted input is the PR title that becomes the squash subject
• Minor (Non-blocking):
  • backend/startup_steps.py:250-267: false "no usable password" warning on every boot of every correct install, plus a committed inactive window across two transactions
  • .github/workflows/release.yml:1109-1139: overwrite guard fails open when the probe is absent (vacuity floor derived from the guarded script)
  • .github/workflows/release.yml:699-1146: three fail-closed gates ordered after git push main, the tag push and gh release create
  • Makefile:518-537: local script-selftests omits the INV-15 parity gate the CI job runs, contradicting Makefile:476-484
  • Makefile:536 / ci.yml:295: extractor self-test gated on a grep of its own subject, with none of the anti-vacuity assertions its sibling has
  • helm/bnk-forge/templates/mcp.yaml:66-75: tcpSocket only — the auth-probe healthcheck never reaches Kubernetes or the IBM installer
  • helm/bnk-forge/values.yaml + _helpers.tpl:125-129: no fail guard for a reserved mcpUsername; the pinned-default population loses MCP silently on upgrade
  • Makefile:485/:767: duplicate version-check target; make warns on every invocation
• Nits: stale cross-PR sequencing comments in release.yml:604-611/:716-723 and extract-breaking-changes.sh:266-270; vestigial filename docstring; ibm_cloud_bnk_forge.sh and mcp_live_smoke.py attribution/rationale drift; scripts/e2e/config.py:184 changeme default; .env.example:58,73,94; three BNK_FORGE_VERSION recommendations in one tarball; e2e-tests.yml:71 dead condition; release.yml:685,708-710,860; fail-open CHANGELOG insertion; .trivyignore expiry; new Docker dependency in pre-push

---

Method: reference sequential merge in #192's order vs. this tree to recover the unreviewed 24-file resolution surface; three context-isolated cold audits over the full diff; every blocker independently re-executed by me before posting. Two cold-audit agents died on environment errors mid-run and their uncovered ground (INV-10/INV-20 auth-resolver enumeration, #179 F3 call sites) was closed by hand — noted for transparency.

[jgruberf5]

Response to review — all 6 blockers + 8 majors + every nit addressed (@bonnyr-f5)

Thank you for the reconstruction-based audit — recovering the ~1,771-line resolution surface my squash hid was exactly the right method, and B1/B2b/B3 were real. Fixes are in 9b1dbdcc (credential/backend/helm/dist/docs) and 43a3508a (CI/release/scripts). CI green: 30/30, CI Gate ✅.

Blockers

• B1 — changeme adoption → takeover. You're right; my "safe" verification missed that changeme is a human password. The adoption is now scoped to v2_155's exact fingerprint — username=='mcp' AND email=='mcp@bnk-forge.local' — matching the migration's own rule, and must_change_password is not cleared on an adopted row. Your reproduction is now a test: operator/changeme (role=admin) → REFUSED, human password intact; plus a named-mcp-wrong-email refusal test. The disable_stale premise you flagged holds again (the adopted row is provably the mcp service account, never a human).
• B2 + B2b — inert MCP_PASSWORD + dropped-alias regression. Took your preferred fix: MCP_SERVICE_USERNAME: ${MCP_SERVICE_USERNAME:-${MCP_USERNAME:-mcp}} / MCP_SERVICE_PASSWORD: ${MCP_SERVICE_PASSWORD:-${MCP_PASSWORD:-}} on backend and mcp in all five compose files. docker compose config confirms a legacy MCP_PASSWORD reaches the backend as MCP_SERVICE_PASSWORD. All five doc sites unified (canonical name, legacy alias noted).
• B3 — unreachable fail-fast. Made the promise true rather than softening the docs: ENVIRONMENT: ${ENVIRONMENT:-development} plumbed into the backend-env anchor of every compose file (Helm already routes it onto api/worker/beat). docker compose config shows ENVIRONMENT reaching the backend, so the staging/production guard now fires as documented.
• B4 — GNU-sed token parse. sed -nE '…(access_token|token)…' (verified under --posix). Probe no longer inverts on macOS.
• B5 — dead, red probe test. Both make script-selftests and ci.yml now enumerate scripts/tests/*.test.sh from the filesystem and fail on empty enumeration or any non-zero rc. The probe test is green post-B4; a new detector-parity.test.sh is enumerated too.
• B6 — spoofable exemption + unlinted PR title. Re-keyed the exemption to the unspoofable "reachable from origin/main|origin/staging" property (fails closed if refs unfetchable); the PR title is now linted on pull_request via env (never interpolated); the rules are split so the spurious-major rule always applies. Mutation cases: spoofed GitHub committer → caught, PR-title [skip ci] → caught, real already-merged tip → exempt, already-merged BREAKING CHANGE bullet → still caught.

Majors

• M1 — kept Stop shipping the MCP service default credential; make Helm use the mcp account #188's "unset → disabled" with an explicit deliberate-consolidation comment (owner-confirmed; Stop shipping a default admin credential; generate it and enforce rotation #186's generate path stays removed).
• M2 — disable_stale_service_user gained skip_username/password_configured: no committed inactive window on a correct install, and the "no usable MCP_SERVICE_PASSWORD" warning is now conditional (no more false warning every boot).
• M3 — overwrite-guard's count derives from docker-bake.hcl's default group (independent) and asserts the probe's exit status before trusting output; shared registry-overwrite-guard.sh.
• M4 — release-notes moved before the irreversible push; a pre-push overwrite-guard step runs in release-final/manual. Design note: realized as pre-push steps + a shared guard rather than a whole new job — same "nothing irreversible before the fail-closed check" invariant, far lower risk in a live pipeline. Flagging the choice explicitly.
• M5 — the INV-15 detector-parity diff is now in make script-selftests (via the enumerated detector-parity.test.sh); local ≡ CI.
• M6 — extractor self-test now has the anti-vacuity assertions (PASS/ok lines + END marker) and runs unconditionally; deleting the flag turns the gate red.
• M7 — Helm mcp exec: python -m bnk_forge_mcp.healthcheck (and added it to the IBM installer's mcp service, which had none).
• M8 — secrets.yaml now fails for a reserved mcpUsername (admin), mirroring the mcpPassword guard; helm template --set secrets.mcpUsername=admin FAILs. Called out in NOTES.txt/values.yaml.

Nits — all dispositioned

Fixed: checksum determinism (deterministic input-digest helper), the stale cross-PR comments in release.yml/extract-breaking-changes.sh, duplicate version-check target, git add dist/VERSION swallow, first-ever-release empty notes, fail-open CHANGELOG insertion, e2e-tests.yml dead condition, make pre-push Docker-dependency note, the .env.example inaccuracies, the vestigial docstring/attribution/rationale comments, BNK_FORGE_VERSION unified, e2e/config.py default.

Two honest exceptions:

1. .trivyignore — expiry refreshed, but confirming CVE-2026-7598 is still unfixed needs a live Trivy/Debian-tracker check the sandbox can't do — treat that as owner-action, not "resolved."
2. dist postgres/redis dev-passwords on host-network — pre-existing and out of scope per your own note; flagged in-tree, not changed here.

Two more design notes to surface, not hide: the checksum fix hashes inputs deterministically, so a genuine rotation rolls pods on the next sync (a helm template-GitOps controller has no lookup); and B6's already-merged exemption fails closed if a protected ref is unfetchable (worst case: over-linting a legit squash tip, never a bypass).

Re-requesting review.

[bonnyr-f5]

Round 2 review — 43a3508 · BLOCK

Three cold audits with no access to this thread (credential/auth, deploy/operator surface,
release/CI), plus Lead re-execution of every blocker below. CI is genuinely green — 30/30,
including Commit Message Lint, ShellCheck, Secret Scan, migration round-trip and
upgrade-from-released-version. Every finding here is invisible to it, which is the point of the
cold pass.

Real credit first: most of round 1 is properly closed, and two of the fixes are better than what I
asked for. Verified closed, by execution:

• B1 — adoption is now scoped to v2_155's creation fingerprint (username == "mcp" AND email == "mcp@bnk-forge.local"), and must_change_password is no longer cleared on an adopted row. The
  legacy seeder provably produced that email (origin/staging:auth_service.py:168
email=f"{username}@bnk-forge.local"). Stronger than I realised: the credential audit established
  from origin/staging's compose that no shipped path ever delivered MCP_SERVICE_USERNAME to the
  backend, so every existing install holds exactly mcp/mcp-service-changeme with that
  synthesised email — the fingerprint covers 100% of the real population, and the
  "custom-MCP_SERVICE_USERNAME" gap your migration docstring apologises for cannot exist.
• B4 — sed -nE 's/.*"(access_token|token)"…', executed under this machine's /usr/bin/sed
  (BSD): {"token":"T1","access_token":"T2"} → T2. Portable.
• B5/M6 — the harness-vacuity work holds under attack. Renaming SELF_TEST, injecting exit 0,
  renaming the --self-test flag, and emptying the scripts/tests/ enumeration each turn the gate
  red. No eaten exit codes anywhere in the surface: the only continue-on-error is the advisory
  MCP job (correctly outside ci-gate's needs), and both set +e blocks re-check rc.
• B6b — the PR title is now linted, via env, never interpolated. Correct fix for the vector.
• LEAD-8 / LEAD-9 — both self-tests unconditional with four anti-vacuity assertions each; every
  stale cross-PR sequencing comment gone.
• INV-14 / INV-21 / INV-31 / INV-24-signing — attacked and held: ci.yml has no paths-ignore
  and runs on a strict superset of release.yml's triggers; no --first-parent/-n remains in any
  release history query; nothing irreversible precedes a fail-closed check in release-final,
  release-manual or release-publish; signing resolves the top-level index digest;
  timestamp() is gone and ROLLING_TAG=/CREATED="" verified via bake --print.
• make shellcheck rc=0 over 45 files including both extensionless hooks, and non-vacuous (a
  planted SC2034/SC2154 script made it rc=2).

---

BLOCKERS

B-1 · The MCP_USERNAME alias makes the new compose files re-seed the human admin to the published changeme — against the image they ship with

dist/docker-compose.yml:51, docker-compose.yml:38,485, docker-compose.local.yml:55,162,
dist/docker-compose.local.yml:29,138, scripts/ibm_cloud_bnk_forge.sh:392,598:

MCP_SERVICE_USERNAME: ${MCP_SERVICE_USERNAME:-${MCP_USERNAME:-mcp}}

I asked for the MCP_PASSWORD alias. Aliasing the password is harmless — it's a value. Aliasing
the username is INV-12 verbatim, and INV-12's Origin line is this same series. Every link below is
Lead-executed:

1. dist/.env.example:18-19 ships BNK_FORGE_REGISTRY=ghcr.io/f5devcentral and
   BNK_FORGE_VERSION=latest; dist/docker-compose.yml:184 is …/bnk-forge-api:${BNK_FORGE_VERSION:-latest}.
2. Unauthenticated ghcr manifest probe:
   latest → sha256:97894d38…6887eb, 3.1.6 → sha256:97894d38…6887eb — the same digest.
   Tags: ["3.1.6","latest","v4.0.0-rc1"]. VERSION is 3.1.6 and values.yaml pins tag: "3.1.6".
3. git show v3.1.6:backend/startup_steps.py:214-221 — "Unconditional: ensure MCP service account
   exists…", called with settings.MCP_SERVICE_USERNAME / MCP_SERVICE_PASSWORD.
4. git show v3.1.6:backend/services/auth_service.py — that ensure_service_user has no
   reserved-name guard and no provenance gate. Its else branch sets hashed_password,
   must_change_password=False, role="admin", is_active=True on whatever row bears the name.
5. git show origin/staging:dist/docker-compose.yml passes MCP_SERVICE_* to no service — only
   BNK_FORGE_USERNAME: ${MCP_USERNAME:-admin} / BNK_FORGE_PASSWORD: ${MCP_PASSWORD:-changeme} to
   the mcp container (:356-357). So today the backend falls back to its code defaults and the human
   admin row is never touched.

Composed, on the population the alias exists to serve — an operator who takes the new dist bundle,
keeps the .env built from the currently-published dist/.env.example (MCP_USERNAME=admin,
MCP_PASSWORD=changeme), and leaves BNK_FORGE_VERSION=latest:

$ docker compose -f dist/docker-compose.yml --env-file <that .env> config
      MCP_SERVICE_USERNAME: admin          # backend, worker, worker-2, beat
      MCP_SERVICE_PASSWORD: changeme
      BNK_FORGE_USERNAME:   admin          # mcp container

A 3.1.6 backend then rewrites the human admin account's hash to the published changeme, clears
must_change_password, and forces role=admin — on every boot. That is the exact inverse of this
PR's purpose, and step 5 shows it is a new exposure created by the compose change. The guards that
refuse it exist only in an image this PR has not published yet.

On the in-tree image the guard does hold, and you tested it —
tests/test_startup_seed_auth.py:90 test_diligent_operator_admin_username_disables_stale_default
asserts the human row survives and still authenticates. Credit for anticipating it. But the tested
outcome is still bad and I'd argue it separately: disable_stale_service_user(skip_username="admin")
disables the legitimate mcp row, ensure_service_user("admin") raises, startup_steps.py:283-287
catches it as a logger.error, and MCP is permanently down while docker compose up -d and
install.sh both report success. Helm treats the identical input as a fatal render error
(secrets.yaml:89, your own M8). One surface hard-fails, five degrade silently.

Nothing in the tree or CI covers the skew: "P2 · Migration Upgrade From Released Version" covers
migrations, not the new compose against the pinned image.

Class fix: drop the username alias — a legacy value for it is never valid (old default admin,
new default mcp), so it has no upside. Keep the password alias. Then stop the skew structurally:
default BNK_FORGE_VERSION to the version this tree builds rather than latest, so a compose file
cannot hand a new credential contract to an image that predates it.

B-2 · ENVIRONMENT is now documented as the production hardening switch, and setting it bricks the backend

The plumbing itself is correct and closes my LEAD-5 — ENVIRONMENT is present in all four compose
files' backend anchor. The problem is what it now switches on.

dist/.env.example:46-51 (new) and user-pack/install-guide.html:336-341 tell the operator that
ENVIRONMENT=staging|production makes the backend "REFUSE TO BOOT unless MCP_SERVICE_PASSWORD (and
the JWT/encryption keys) are set to real, non-default values". core/config.py:220-262
validate_production raises on five conditions, and three are unsatisfiable from a compose install:

• Lead-verified delivery: JWT_SECRET_KEY|ENCRYPTION_KEY|ALLOWED_ORIGINS appear in 0 of
  docker-compose.yml, docker-compose.local.yml, dist/docker-compose.yml,
  dist/docker-compose.local.yml environment: blocks, and class Config (config.py:190) declares
  no env_file — so a .env entry cannot reach the process. Your own compose comments state this rule.
• config.py:82 ALLOWED_ORIGINS: str = "*" → the wildcard issue always fires.
• config.py:40-52 _persist_or_load_key returns (key, True) even on the load-from-disk branch
  ("Loaded from file (still auto-generated, not user-provided)") → both key issues are permanent,
  not first-boot-only.

Executed with exactly the env set the dist compose delivers:

$ ENVIRONMENT=production MCP_SERVICE_PASSWORD=Str0ngSharedSecret python -c "Settings().validate_production()"
  ✗ JWT_SECRET_KEY was not explicitly set …
  ✗ ENCRYPTION_KEY was not explicitly set …
  ✗ ALLOWED_ORIGINS contains '*' (wildcard) …
→ SystemExit(1)

The operator who follows the new instruction gets api + both workers + beat in a restart loop,
listing three problems the shipped .env cannot fix, while compose reports the containers created.
The remedy the message gives — hand-edit docker-compose.yml — is a file install.sh replaces.

Class fix: plumb a switch and the settings it gates in one change. Add those three vars to every
x-backend-env anchor and document them in dist/.env.example. Freeze it: assert that every var
named in validate_production's issue list is settable from the shipped .env on each path.

B-3 · The re-keyed commit-lint exemption is vacuous on exactly the pushes it protects, and the other exemption is self-settable

scripts/lint-commit-markers.sh:161-171. My LEAD-1 asked you to key the exemption on an unforgeable
property. _already_merged is unforgeable — but it is evaluated after the push has landed, so
origin/main/origin/staging already contain every commit in github.event.before..github.sha.
The exemption therefore fires for every commit in the range. My own round-2 run shows it:

$ RANGE=origin/staging~1..origin/staging bash scripts/lint-commit-markers.sh
commit-lint: commit 4a52ed4… is marker-exempt (already merged to origin/main or origin/staging …)

So rule 1 never fires on any push to main or staging — precisely the events where a [skip ci]
marker suppresses the workflow run and, per #182, stops the release. The Fails CLOSED note at :50
covers ref unavailability, not this ordering.

And the second exemption is worse than what it replaced:

subject "fix: thing"                  + body "[skip ci]"  -> rc=1  (caught)
subject "release: notes for the team" + body "[skip ci]"  -> rc=0  ("marker-exempt (release-bot subject)")

grep -qE '^release: ' is a property of the message being linted — strictly more spoofable than the
committer identity you removed for being spoofable. The header at :39 claims it is "scoped to the
exact release-bot subject prefix"; the bot's subject is release: vX.Y.Z [skip ci] and
release.yml:126's own loop guard already requires ^release: v[0-9]+\.[0-9]+\.[0-9]+ plus a
trailing [skip ci] — that tightening was not adopted here.

Class fix: compute already-merged against the base of the scanned range
(git merge-base --is-ancestor $sha $BEFORE), not the post-push tip. Drop the release: exemption
or extract release.yml:126's predicate into one function both call.

---

MAJORS

M-1 · The non-exemptible spurious-major rule contradicts the detectors it protects — in both directions — and can mint an unamendable wedge

lint-commit-markers.sh:132-148, deliberately never exempted (:53-56).

Direction 1 — it rejects shapes the detectors deliberately support, per those detectors' own
self-test fixtures (compute_version_bump.sh:399 "F7: dash-bullet marker → major";
extract-breaking-changes.sh:234 dash-bullet expect-trigger=1; :141 markdown-bold expect-trigger=1):

commit body line	detectors	rule 2
- BREAKING CHANGE: the --legacy flag was removed	major + note	rc=1 rejected
**BREAKING CHANGE:** boom.	major + note	rc=1 rejected
BREAKING CHANGE: indented, not a footer	inert (:155 expect 0)	rc=1 rejected

Direction 2 — it rejects a shape the detectors ignore, and its message is false about it. On
4a52ed4 (current origin/staging tip, an already-merged GitHub squash, unamendable) rule 2 errors
on the body line - BREAKING CHANGE footer in the BODY of a fix-subject commit → major (non-,
claiming it "spuriously triggers a major release". Lead-executed on that exact commit in a detached
worktree:

scripts/compute_version_bump.sh --since-tag 4a52ed4~1  -> BUMP_TYPE=patch
scripts/extract-breaking-changes.sh 4a52ed4~1 4a52ed4  -> rc=0, empty

Neither a major bump nor a release note. #179's anchoring already removed the harm this rule claims
to prevent. A per-commit sweep of origin/main finds 1 of 68 commits tripping it, so the base
rate over a release-merge range is real.

The wedge is reachable: inputs.release_notes is linted nowhere (release.yml:61-66 →
interpolated into the release commit at :918, the tag message at :926). An operator typing a
bullet-form breaking note mints an unamendable commit on main that rule 2 refuses forever — any
range containing it (e.g. a hotfix cut from main, PR'd to staging) goes red. That is INV-28
reopened by the rule that was supposed to be the safe half.

Class fix: define rule 2 as the complement of what the detectors accept, from one shared
predicate rather than a second hand-written regex; add those three shapes as negative fixtures; give
rule 2 the same already-merged exemption (the unamendability argument is identical); and lint
inputs.release_notes through this script before it becomes a commit message.

M-2 · The overwrite guard's vacuity floor counts every bake group, so an ordinary docker-bake.hcl edit wedges the release

scripts/registry-overwrite-guard.sh:34-42 (duplicated at release.yml:1189-1193). The comment says
"count docker-bake.hcl's default group"; the code is unscoped —
sed -n 's/.*targets = \[\(.*\)\].*/\1/p' over the whole file. It works today only because
docker-bake.hcl:49-50 has exactly one targets = [ line.

current docker-bake.hcl                                  -> IMAGES_N=7   guard rc=0
+ group "backend" { targets = ["api","worker","beat"] }  -> IMAGES_N=10  guard rc=1
   "classified 7 of 10 images; treating as inconclusive"

Adding any second group — an ordinary edit — makes release-final's pre-push gate refuse forever
with a message blaming the registry ("auth / network / rate-limit … Re-run once the registry is
reachable"), pointing away from the file just edited. The only escape offered is FORCE=true, which
skips the immutable-tag protection the guard exists for. This is the M3 fix opening a hole beside the
one it closed. Class fix: derive the floor from the tool —
docker buildx bake --print default | jq '.group.default.targets | length' — and separate
"bake-file parse mismatch" from "registry unreachable" in the remediation text.

M-3 · The new pre-push test uses mapfile, so git push fails on stock macOS

scripts/tests/registry-tag-probe.test.sh:93 — mapfile -t LIST < <(bash "$PROBE" --images).
mapfile is bash 4+. macOS ships bash 3.2.57. Lead-executed:

$ /bin/bash --version → GNU bash, version 3.2.57(1)-release (arm64-apple-darwin25)
$ /bin/bash scripts/tests/registry-tag-probe.test.sh
  probe.test.sh: line 93: mapfile: command not found   rc=127

This PR is what wires that file into make script-selftests → ci-gates → pre-push →
.githooks/pre-push, and Makefile:13 is SHELL := /bin/bash. On a stock-macOS checkout the gate
fails and the push is blocked; a machine with homebrew bash first in PATH masks it entirely (mine
resolves to 5.3.9, which is why your local run was green), and CI is Linux so CI is green too. The
Makefile branches on Darwin, so macOS is a supported platform. Compounding, on bash 3.2
compute_version_bump.sh:260 (_b=${_b//\\n/$'\n'}) hits the O(n²) substitution cliff: the ~80 KB
Test-7 fixture took 134 s under 3.2 vs 0 s under 5.3, and the full self-test did not finish in
6 minutes. Class fix: the pre-push gate must run under the oldest interpreter the repo supports —
replace mapfile with while IFS= read -r, assert the bash version at the top of ci-gates, and
build the Test-7 tail with printf/awk.

M-4 · The mcp liveness probe now restarts pods for a dependency outage, on Kubernetes only

helm/bnk-forge/templates/mcp.yaml:79-84 changes mcp liveness from tcpSocket to
exec: python -m bnk_forge_mcp.healthcheck. healthcheck.py:57-62 returns 1 when the backend is
merely unreachable, and its comment ("Docker start_period handles this") is true for compose and
false for Kubernetes, which has no start_period for liveness. A backend rollout, a Postgres blip or
a credential drift lasting >90 s (3 × periodSeconds: 30) makes kubelet kill and restart every mcp
pod repeatedly; restarting mcp fixes neither cause, so they settle into CrashLoopBackOff. Compose
keeps the same probe as a healthcheck (marks unhealthy, never restarts) — so a change made to
unify the paths gave them opposite failure semantics. Secondary: readiness at periodSeconds: 10
performs a real /api/auth/login (bcrypt + last_login_at UPDATE + commit) every 10 s per replica,
forever, with a User logged in: mcp INFO line each time. Class fix: auth probes belong on
readiness only; liveness must test the process, not its dependency.

M-5 · checksum/secret lags the rotation it exists for, and offline-render GitOps regenerates everything

_helpers.tpl:197 hashes toYaml .Values.secrets plus the pre-render lookup of the live
Secret's .data. Determinism is fixed — two consecutive renders gave identical digests on all four
deployments, which was the point. But secrets.yaml:59-65's changeme → randAlphaNum 24 rotation
happens inside the render whose checksum was computed from the pre-rotation data, so on the upgrade
that rotates, the digest is unchanged and the pods do not roll — secretKeyRef env is injected at
pod start, so api/worker/beat/mcp keep the old credential. Masked in this release only because the
pod template changes anyway (tag 3.0.1→3.1.6, new env). Converse: on a fresh install $existing is
nil, so the first helm upgrade — even a no-op — rolls all four. Separately and PLAUSIBLE (no
cluster to prove it): under helm template-based GitOps lookup is inert, so every sync regenerates
every key, and this PR adds admin-password and mcp-password to that set while a rotating
encryption-key makes previously-encrypted data undecryptable. Class fix: hash the values
actually being written via a shared helper both files consume; stop generating secrets in-chart.

M-6 · The chart pins an image that predates the behaviour its NOTES promise

values.yaml:19 tag: "3.1.6" / appVersion: 3.1.6, kept in lockstep by
sync-version-artifacts.sh --check. NOTES.txt:32-38 tells the operator the secret's value is what
the backend "rotates it to if you upgraded from a build that shipped a default password" — but
git show v3.1.6:backend/services/auth_service.py has no _rotate_known_default_admin at all
(seed_admin_user returns immediately when users exist), and v3.1.6:core/config.py:101-103 still
carries DEFAULT_ADMIN_PASSWORD = "changeme". So helm upgrade leaves admin/changeme live while
NOTES directs the operator at a secret that does not authenticate. Same mismatch in
docs/DEPLOYMENT.md:60-66 and docs/INSTALLATION.md:129-141. Related: CHANGELOG.md:28-29 and
user-pack:321 place the boot-time check "from 4.0.0", but VERSION is 3.1.6 and no 4.0.0
version artifact exists. Same class as B-1: an artifact asserting behaviour absent from the image it
pins.

M-7 · The MCP rotation runbook instructs operators to set variables nothing reads (INV-17, again)

mcp-server/README.md:108 step 1 says "Update MCP runtime credentials in environment
(MCP_USERNAME, MCP_PASSWORD)"; :99 claims MCP_SERVICE_PASSWORD is "exposed to MCP as
MCP_PASSWORD". The container reads only BNK_FORGE_* (mcp-server/src/bnk_forge_mcp/config.py:19-22);
the backend reads only MCP_SERVICE_*. On Helm the mcp Deployment sources BNK_FORGE_* from the
release Secret, so the runbook does nothing; on compose it "works" only through B-1's poisoned alias —
the runbook actively instructs setting the variable that breaks the install. Makefile:630's
smoke-mcp-live banner has the same problem (exporting those in a shell changes nothing until
docker compose up -d). INV-17's Origin line is this series. Class fix: operator docs name only
variables that appear in a compose environment:/Helm env: for the process being configured;
freeze it with a script that extracts documented var names and fails when one has no binding.

---

MINORS

• Fresh admin seed accepts a published default. auth_service.py:388-392 takes
  DEFAULT_ADMIN_PASSWORD verbatim with no known-default refusal, while the MCP path rejects
  MCP_KNOWN_DEFAULT_PASSWORDS; helm/.../secrets.yaml fails for mcpPassword (:76) and
  mcpUsername (:89) but has no adminPassword guard. The comment at :384 ("never seed a
  known/published default") is false when the operator supplies one. Low reachability, and this PR
  improved it — origin/staging:.env.example:89 shipped # DEFAULT_ADMIN_PASSWORD=changeme and you
  changed it to empty — so: minor, but the asymmetry is worth closing.
• A gate reachable only through the else of a hardening flag. routes/benchmarks.py:1454-1490
  returns None as soon as the strict BENCHMARK_AGENT_AUTH_REQUIRED branch passes, so the
  must-change/user-resolution gate at :1519-1528 runs only when the flag is off. Not exploitable
  today (with the flag on a caller needs a matching agent_id claim, which no route mints for a human,
  so a must-change admin gets 4401 rather than a pass) — but the comment at :1512 calling this "the
  one JWT-resolving entry point that skipped the gate" is wrong about its own other branch.
• Admin passes the Python guard. auth_service.py:237,511 is exact-match; secrets.yaml:88 is
  lower|trim. MCP_SERVICE_USERNAME=Admin mints a second role=admin, must_change=False account
  on compose while Helm refuses it.
• disable_stale_service_user leaves the default hash in place (auth_service.py:640-647); only
  is_active flips, so the compensating route guard is load-bearing and complete only today.
• version-consistency mis-diagnoses a legal YAML comment. Inserting a column-0 comment after
  ^image: in values.yaml makes --check rc=1 claiming "key renamed/removed? — vacuous check" and
  print a remediation (--write 3.1.6) that also fails. INV-29's real defect is closed — both modes
  now refuse — but the diagnosis and the fix it prints are both wrong.
• The "single-sourced" overwrite policy exists in three divergent copies.
  registry-overwrite-guard.sh is called only from release.yml:781,937; the actual publish gate
  (:1142-1230) still open-codes ~60 lines, and Makefile:1290-1315 open-codes a third variant that
  omits the PROBE_N != IMAGES_N floor. The guard has no test and no local caller.
• Two docstrings assert the INV-15 parity job does not exist. compute_version_bump.sh:79-83 and
  extract-breaking-changes.sh:14-20 say to "keep the two copies in lock-step by hand";
  scripts/tests/detector-parity.test.sh is in this tree, run by both make script-selftests and
  ci.yml:277-296, and goes red on injected drift.
• docker-bake.hcl:36-42 says "BOTH paths that bake --push this file" — there are four;
  Makefile:1334 push-customer-build and :1386 push-customer-build-multiarch have no probe.
• make pre-push ≡ CI is still not true: artifact-network-self-test (ci.yml:506) and
  migration-collision-check have no make target.
• .githooks/pre-push:17-22 — under set -e the if [ $? -ne 0 ] block is dead, so the
  "PUSH BLOCKED" migration message is unreachable.
• publish-signed-images.sh:145 sets provenance metadata.buildStartedOn from date -u at
  signing time — a knowingly wrong timestamp in the attestation.
• release.yml:266 polls gh run list --limit=20 then filters by SHA; >20 newer runs inside the
  45-minute window and the release times out claiming no run exists.
• secrets.yaml:88 trim on a nil mcpUsername raises wrong type for value instead of the
  guard message — guard with kindIs "invalid" as adminMustChange already does.
• dist/install.sh:82 auto-creates .env from an example shipping MCP_SERVICE_PASSWORD=, so
  the mcp auth probe is guaranteed UNHEALTHY on every default dist install, yet the installer prints
  "Installation complete!" with no mention of MCP. .env.example:4 still opens "No .env file is
  needed!", contradicting its own line 58.
• Coverage gap worth closing: no fixture drives seed_auth_step against a DB where admin still
  holds changeme — legacy_db gives it "real-admin-secret" — which is the only shape a real
  upgrade has.

---

Verdict

BLOCK at 43a3508. Round 1's findings are genuinely closed and the gate-vacuity work is solid.
The three blockers are all one shape — a fix whose reach was not traced: the alias reaches an image
without the guard, the ENVIRONMENT switch reaches a validator whose other requirements are
undeliverable, and the exemption reaches a ref state where it always fires. B-1 is the one I would fix
first: it re-creates the published-default admin credential this whole series exists to remove.

Tests/gates as run here: 106 + 124 backend and 12 mcp-server tests pass; ruff clean; make shellcheck
rc=0 over 45 files; single alembic head v2_155 with neither new revision mutated in place; the 2
mypy errors are in core/maintenance.py, untouched by this diff.

[jgruberf5]

Round-2 response — all 3 blockers + 4 majors + every nit addressed (@bonnyr-f5)

You nailed the through-line: "a fix whose reach was not traced." Each round-1 fix reached one consumer further than I verified. Round-2 fixes are traced end-to-end (legacy .env render, validate_production from the shipped env, the exemption against the range base). Fixes in aed2fdcf (credential) + bc0a36f5 (CI/release).

Blockers

• B-1 (INV-12) — the username alias. Dropped it entirely — the compose default is ${MCP_SERVICE_USERNAME:-mcp}, no MCP_USERNAME fallback (a legacy value is never valid: old default admin, new default mcp). Verified: docker compose config with a legacy MCP_USERNAME=admin .env now renders mcp on all five surfaces. Password alias kept (aliasing a value is safe). Structural half: BNK_FORGE_VERSION now defaults to 4.0.0, not latest — so compose can't hand the new credential contract to the pre-guard image. (If the release tag differs from 4.0.0, that default needs a matching bump — flagging.)
• B-2 — ENVIRONMENT bricks the backend. Plumbed the switch and the settings it gates: JWT_SECRET_KEY/ENCRYPTION_KEY/ALLOWED_ORIGINS added to every x-backend-env anchor and documented in dist/.env.example; config.py treats an empty ${VAR:-} as unset (auto-generates rather than passing an empty key). For _persist_or_load_key I did not take the literal "load-from-disk → not-auto" (that weakens SEC-006 to fire-once) — instead a .autogen sidecar marker: auto-generated keys keep the permanent fail-fast, only an operator-provisioned on-disk key validates. Verified: ENVIRONMENT=production + real values → validate_production() passes; at defaults → it raises with messages the shipped .env can fix. New tests assert every var in the issue list both trips and clears from the shipped env.
• B-3 — the exemption fires post-push. Re-keyed to the range base (git merge-base --is-ancestor $sha $BEFORE), so a new commit in the push is linted while a genuinely-already-merged base commit is exempt. Dropped the self-settable release: prefix for release.yml's own fingerprint (^release: vX.Y.Z + trailing skip marker). New mutation suite: new-push marker → caught; base commit → exempt; spoofed release: <prose> → caught.

Majors

• M-1 — rule 2 vs the detectors. Rule 2 is now the exact complement of the detector (reuses a single-sourced scripts/lib/breaking-change-detect.sh), so it flags only a marker-shaped line the detectors would silently ship as a patch; dash-bullet / markdown-bold / indented are now negative fixtures; rule 2 got the already-merged exemption; and inputs.release_notes is linted through the script in release.yml.
• M-2 — guard vacuity floor. Now docker buildx bake --print default | jq '.group.default.targets|length' (scoped to the default group); a second bake group no longer wedges it; parse/tooling failures messaged distinctly from registry-unreachable; the three divergent copies single-sourced into one guard with a test.
• M-3 — stock-macOS bash 3.2. mapfile → while IFS= read -r; the O(n²) ${//} self-test fixture → O(n) awk (kills the 134s Test-7 cliff). Made the gates 3.2-clean rather than asserting bash≥4, so pushes still work on stock macOS.
• M-4 — mcp liveness. Readiness = the exec auth-probe; liveness = tcpSocket — a backend outage no longer restarts the pod. Runbook/mcp_live_smoke now name only the vars each process actually reads.

Nits — all dispositioned

Fixed: fresh-admin known-default refusal + helm adminPassword guard; secrets.yaml nil-mcpUsername kindIs guard; case-insensitive reserved-name check (Admin now refused); disable_stale neutralizes the default hash; the benchmarks/version-consistency/docker-bake "BOTH paths"/.githooks dead-$?/publish-signed buildStartedOn/gh run list --commit items; the parity docstrings; the coverage-gap fixture (admin holding changeme); the install.sh/.env.example "No .env needed" contradictions.

Two honest flags carried forward: BNK_FORGE_VERSION=4.0.0 assumes that release tag; and the .autogen marker means a pre-existing auto-gen key (no marker) reads as operator-provided — only relevant to a deploy that already permanently fail-fasted under the old code.

CI re-running now. Re-requesting on green.

[jgruberf5]

@bonnyr-f5 — green, re-requesting as promised.

The round-2 batch landed one follow-up (2e19719f): the disable_stale_service_user hash-scrub you asked for collided with the re-enable guard's own regression test, because _seed_disabled_default_mcp was building its "disabled while still holding the published default" state by calling disable_stale — which now scrubs the hash, so holds_known_default_password was false and the PUT re-enable was (wrongly) allowed.

Fix seeds that state directly (is_active=False on the default-hash row) so the guard's real scenario — a row taken inactive by a path that leaves the credential intact, i.e. a manual operator PUT — is what's exercised, and asserts the default hash survives the seed. The neutralisation and its two asserting tests are unchanged. Corrected the now-stale guard comment in routes/auth.py.

Verified locally: TestServiceAccountReEnableGuard 2/2, the three affected auth files 97/97, ruff clean. CI: 30/30 green, mergeStateStatus CLEAN.

[bonnyr-f5]

Round 3 review — 2e19719 · BLOCK

Three cold audits with no access to this thread (credential/auth, deploy surface, release/CI),
plus Lead re-execution of both round-2 blockers. CI is genuinely green — 27/27, P3 Integration
included. Every finding below is invisible to it.

Round 2's three blockers are closed as defects, and the reasoning behind two of them is better than
what I asked for. One fix overshot into dead code rather than landing wrong (M-6). Verified by
execution:

• B-3's security hole is genuinely closed — the exemption no longer fires post-push, and the
  sibling is narrowed: _is_release_bot_subject (:131-134) now demands a real version and the
  trailing skip marker, so release: <prose> is no longer exempt (though release: v0.0.1 [skip ci]
  still self-exempts — see minors). But the fix overshot
  into dead code, and the header now claims a feature that does not exist — see M-6, which I had
  called closed until the release audit proved otherwise.
• The mapfile portability major is closed on the path that matters —
  scripts/tests/registry-tag-probe.test.sh:93-95 uses while read and documents the bash-3.2
  floor. Swept: no mapfile/readarray/declare -A/${x^^} in any changed script reachable from
  .githooks/pre-push → make pre-push. (Local interpreter: GNU bash 3.2.57(1) arm64-apple-darwin25.)
• B-1's credential half — dropping the MCP_USERNAME alias is right, and for a sharper reason
  than "a legacy value is never valid": the legacy dist value was admin, which
  _is_reserved_human_username refuses outright.

A lot of the hard work here holds up under attack, and it is worth saying so precisely, because it
is most of the diff. The credential audit tried to falsify and failed on: empty-string handling
("" correctly routes to the unset branch on all four gated vars), reserved-name parity between
auth_service.py:250 and the chart's lower | trim, fail-closed SystemExit on an unwritable keys
dir (executed against a real uvicorn lifespan — the process genuinely refuses to start and no
plaintext reaches the logs), the fresh-seed replica race (create_user flushes before the keys file
is written, so the loser cannot clobber it), upgrade admin rotation under with_for_update(), #193
M2's no-inactive-window property, and single-head migrations with a real backfill-scope test. The
deploy audit confirmed env parity across all four compose paths, a clean helm lint, all three
chart fail guards firing including case/trim variants, and secretsChecksum stable across renders
and sensitive to real input changes — the randAlphaNum-churn defect is genuinely fixed.

The two blockers below are both round-2 fixes that were correct where they were written and were
never traced to what they now reach. That is the same through-line as round 2, and it is the reason
this is still a BLOCK rather than a nit list.

---

Blockers

B-1 · Every packaged install path pins an image tag that does not exist

dist/docker-compose.yml:203,244,276,308,338,364,390 · dist/.env.example:24 ·
scripts/ibm_cloud_bnk_forge.sh:32,489-602

Round 2's structural half moved the dist/ pin off latest (which resolved to the pre-guard 3.1.6
image) onto a hardcoded 4.0.0. 4.0.0 has never been published.

GHCR holds exactly three tags in all six repos:

api/worker/beat/frontend/proxy/mcp -> "3.1.6", "latest", "v4.0.0-rc1"

$ docker pull ghcr.io/f5devcentral/bnk-forge-api:4.0.0
Error response from daemon: manifest unknown
$ docker manifest inspect ghcr.io/f5devcentral/bnk-forge-api:3.1.6    # control
3.1.6 OK

That is what a fresh install renders. dist/install.sh never sets BNK_FORGE_VERSION, so with the
empty .env it creates:

image: ghcr.io/f5devcentral/bnk-forge-api:4.0.0
image: ghcr.io/f5devcentral/bnk-forge-beat:4.0.0
image: ghcr.io/f5devcentral/bnk-forge-frontend:4.0.0
image: ghcr.io/f5devcentral/bnk-forge-mcp:4.0.0
image: ghcr.io/f5devcentral/bnk-forge-proxy:4.0.0
image: ghcr.io/f5devcentral/bnk-forge-worker:4.0.0

dist/.env.example:24 hardcodes the same value, so copying the example does not rescue it, and
ibm_cloud_bnk_forge.sh:365 prefers the repo's canonical dist/docker-compose.yml, so the IBM
Cloud path inherits it.

The pin is a forward-dated guess. The arithmetic is right — at this head:

$ bash scripts/compute_version_bump.sh --since-tag v3.1.6      # HEAD=2e19719
BUMP_TYPE=major
TARGET_VERSION=4.0.0

— but only a merge to main cuts 4.0.0. A merge to staging cuts an RC published as
v4.0.0-rc.N, which the unprefixed pin cannot resolve either. So dist/ resolves to nothing at all
for the entire staging soak, and it is a frozen literal that will be wrong again at 4.0.1.

Why no gate saw it. make version-check → sync-version-artifacts.sh --check is the guard
whose stated purpose is exactly this (ci.yml:132-134: "the release publishes only :${VERSION} …
or ImagePullBackOff / silent drift (#177 Blocker 2)"). It cannot see dist/ by construction —
sync-version-artifacts.sh:16-18:

# Deliberately out of scope, and NOT claimed here: ... the dist/ documentation
# copies (dist/.env.example, dist/README.md), which are packaged separately

Nothing rewrites dist/ at release time either — the only __VERSION__ substitution in the tree
(ibm_cloud_bnk_forge.sh:652) applies to that script's own generated heredoc.

B-1b · The two deployment paths pin two different versions, and CI enforces the wrong one

Path	Pinned image	Status
Helm (values.yaml:19, Chart.yaml:6)	3.1.6	exists; predates this PR's credential contract
dist/ compose + .env.example + ibm_cloud_bnk_forge.sh	4.0.0	has the contract; does not exist

Both cannot be right, and today neither is. Run at this head:

HEAD=2e19719  VERSION=3.1.6
  OK    helm image.tag = 3.1.6
  OK    Chart appVersion = 3.1.6
  OK    frontend version = 3.1.6
  OK    operator image.tag = 3.1.6
  OK    operator appVersion = 3.1.6
exit=0

Green — five assertions, every one about 3.1.6, none able to see the 4.0.0 in dist/. The check
actively holds Helm at an image that lacks the code the chart assumes, while being structurally
blind to the path naming an image nobody published.

Fix. A deployment artifact must not name a version that does not exist yet. Bring
dist/docker-compose.yml, dist/.env.example and ibm_cloud_bnk_forge.sh's default under
sync-version-artifacts.sh (write and --check) so the pin is derived from VERSION and drift
is a red check forever; the header's dist/ disclaimer is the hole and should go. Worth adding
alongside it: a CI step that resolves every image: pin in every shipped compose file against the
registry and fails on manifest unknown — that catches this class with no reviewer involved.

---

B-2 · The .autogen marker makes SEC-006's key fail-fast fail open on every upgrade

backend/core/config.py:65-75 (read side) · :256-286 (validator) ·
backend/tests/unit/test_core_config.py:271-278 (test that enshrines it)

Round 2's B-2 fix distinguishes an operator-provisioned key from a platform-generated one by a
sidecar <key>.autogen marker, classifying on absence (config.py:74):

auto = os.path.exists(marker_path)

The marker is new in this PR. Every keys volume created by a previously released version holds
jwt_secret.key / encryption.key with no marker, so both classify as operator-provided and
validate_production raises neither key issue.

Executed against the head's own _persist_or_load_key:

fresh boot 1: jwt_auto=True enc_auto=True -> SystemExit (fail-fast)
fresh boot 2: jwt_auto=True enc_auto=True -> SystemExit (fail-fast)
fresh boot 3: jwt_auto=True enc_auto=True -> SystemExit (fail-fast)
keys dir after 3 boots: ['encryption.key', 'encryption.key.autogen',
                         'jwt_secret.key', 'jwt_secret.key.autogen']

keys volume as written by the PREVIOUS release: ['encryption.key', 'jwt_secret.key']
jwt auto_generated flag : False
enc auto_generated flag : False
>>> validate_production PASSED   <-- boots with an AUTO-GENERATED JWT secret

The affected population is not incidental — it is the whole population. The base commit passed
ENVIRONMENT to the backend in zero of four compose files (verified: 4a52ed4's
docker-compose.yml, docker-compose.local.yml, dist/docker-compose.yml,
dist/docker-compose.local.yml — no occurrences). This PR plumbs it precisely so operators can flip
the hardening switch. The operators who flip it are therefore, by construction, operators upgrading
an existing deployment — and bnk-forge-keys is a named volume that survives pull && up -d
(dist/docker-compose.yml:79,214,504); Helm mounts an equally persistent PVC.

This is a regression, not a pre-existing gap. At 4a52ed4, _persist_or_load_key returned:

return key, True  # Loaded from file (still auto-generated, not user-provided)

The fix inverted a deliberate, commented decision.

Second trigger, same root cause. The marker write shares a try with the key write
(config.py:83-96). If the key persists and the marker write fails — ENOSPC, a volume that goes
read-only between the two open()s — the next boot reads marker absent -> auto=False and the
fail-fast is gone on a fresh install too.

The test freezes the defect as intent. test_operator_provisioned_key_is_not_flagged
(test_core_config.py:271-278) writes a key file with no marker and asserts auto is False. That
fixture is the upgrade shape. There is no test for "keys volume from a previous release +
ENVIRONMENT=production must still fail fast."

Fix. Fail closed: absence of evidence of provisioning is not evidence of provisioning. The app
is the only writer of KEYS_DIR on every shipped path, so the correct default for a marker-less key
file is the old one — auto-generated. Invert the sentinel (an explicit <filename>.operator opt-out
for the pre-seed path, which is currently undocumented anyway), or keep the polarity and pair it
with a first-boot stamp that writes the marker beside any pre-existing marker-less key, plus a
separate try so a partial write cannot downgrade provenance.

---

Majors

Seven majors. Five of them (M-1..M-5) share one root cause with B-1: a shipped artifact depends
on code the image it pins does not contain. That is INV-32 for the third round running, which is
why the fix for B-1 needs to be structural rather than a value edit. M-6 and M-7 are independent
release/CI defects.

M-1 · The Helm chart pins the pre-guard image while shipping the post-guard contract and NOTES

helm/bnk-forge/values.yaml:19 · Chart.yaml:6 · templates/NOTES.txt:32-38

The chart moves to 3.1.6 — the exact image this diff's own dist/docker-compose.yml:23-28 calls
"the pre-guard 3.1.6 image" and refuses to default to — while adding DEFAULT_ADMIN_PASSWORD,
DEFAULT_ADMIN_MUST_CHANGE, MCP_SERVICE_USERNAME, MCP_SERVICE_PASSWORD to the pod env and
rewriting NOTES to describe behaviour that image lacks.

Traced from the registry rather than assumed. The 3.1.6 index's config blob carries
org.opencontainers.image.revision = 436d07db89d302aea3fc991bc29705196816bc8f, and at that revision:

$ git grep -c DEFAULT_ADMIN_MUST_CHANGE   436d07d -- backend   ->  0 files
$ git grep -c _rotate_known_default_admin 436d07d -- backend   ->  0 files
$ git grep -c disable_stale_service_user  436d07d -- backend   ->  0 files
$ git grep -c _RESERVED_HUMAN_USERNAMES   436d07d -- backend   ->  0 files
(same four at 2e19719: 2, 1, 8, 1 files)

436d07d:backend/core/config.py:101   DEFAULT_ADMIN_PASSWORD: str = "changeme"
436d07d:backend/services/auth_service.py:139   existing_users = db.query(User).count()
436d07d:backend/services/auth_service.py:140   if existing_users > 0:
436d07d:backend/services/auth_service.py:141       return None

class Config: extra = "ignore", so DEFAULT_ADMIN_MUST_CHANGE is silently discarded — an operator
setting secrets.adminMustChange: false gets must_change_password=True regardless.

NOTES tells the operator the minted Secret value "is what authenticates now" and the old one "no
longer authenticates". On the pinned image seed_admin_user early-returns with no rotation path at
all, so both statements are false and changeme still works. The chart tells an operator that a
live published credential is dead.

Fix: do not ship a chart whose image.tag predates the contract its templates emit — gate the
chart on the release carrying the guards, or add a fail keyed on appVersion.

M-2 · The bundle contradicts itself on BNK_FORGE_VERSION

dist/README.md:30-33 · user-pack/install-guide.html:164-168 (both bundled by make dist)

dist/.env.example:19-24 and dist/docker-compose.yml:21-28 warn emphatically "do NOT default to
latest, which currently resolves to the pre-guard 3.1.6 image". In the same tarball,
dist/README.md gives `latest` (or pin e.g. `3.1.6`) and the install guide gives latest
— "To pin a specific version, use its tag, e.g. 3.1.6." Both recommend the two values (verified
byte-identical digests) the compose file forbids.

The guide's next step is docker compose exec backend cat /app/keys/initial_admin_password —
_persist_generated_password does not exist at 436d07d, so that file is never written, the command
errors, and the real password is the changeme the guide says no longer ships.

M-3 · The MCP_PASSWORD alias is dead for the only legacy value that exists, and install.sh's new warning fails open on it

dist/.env.example:41-42 · dist/docker-compose.yml:63 · dist/install.sh:355-363

Round 2 kept the password alias on the reasoning that "aliasing a value is safe". The old published
dist/.env.example (4a52ed4:dist/.env.example:29-30) shipped exactly MCP_USERNAME=admin /
MCP_PASSWORD=changeme, and changeme is in MCP_KNOWN_DEFAULT_PASSWORDS. So the alias resolves to
a value the backend refuses:

== backend   MCP_SERVICE_PASSWORD = 'changeme'
== mcp       BNK_FORGE_PASSWORD   = 'changeme'

→ startup_steps.py:236 _mcp_pw_usable = False → disable_stale_service_user → mcp disabled.
The alias "keeps working" only for a password no shipped artifact ever produced.

The new install.sh warning, added precisely to surface "MCP is not active", is suppressed on that
input. Executing the shipped snippet verbatim:

shipped dist/.env.example (MCP_SERVICE_PASSWORD=)     WARNING SHOWN (MCP not active)
legacy .env (MCP_PASSWORD=changeme)                   no warning; MCP_PW=[changeme]
legacy .env (MCP_PASSWORD=mcp-service-changeme)       no warning; MCP_PW=[mcp-service-changeme]
quoted empty MCP_SERVICE_PASSWORD=""                  no warning; MCP_PW=[""]
real value                                            no warning; MCP_PW=[Sup3rSecret]
commented out only                                    WARNING SHOWN (MCP not active)

Rows 2-4 are the fail-open cells: the upgrading operator gets ✅ Installation complete! while MCP
is permanently disabled. Row 4 is also a parser skew — compose strips the quotes and renders UNSET.

Fix: reject the known defaults and strip surrounding quotes in install.sh; correct
.env.example to say the alias works only for a non-default value. Siblings carrying the same
alias: docker-compose.yml:63, docker-compose.local.yml:57, dist/docker-compose.local.yml:33,
ibm_cloud_bnk_forge.sh:399.

M-4 · A default helm install cannot boot, and the new NOTES walks the operator into it

helm/bnk-forge/values.yaml:109,111 · backend/core/config.py:288-296

The default render sets ENVIRONMENT=production and ALLOWED_ORIGINS=https://localhost on
api/worker/beat; validate_production() treats that pair as fatal → SystemExit(1) →
CrashLoopBackOff on all three.

$ helm template rel helm/bnk-forge | <env dump>
  rel-bnk-forge-api   ALLOWED_ORIGINS = 'https://localhost'
  rel-bnk-forge-api   ENVIRONMENT     = 'production'

Honestly scoped: this is pre-existing — base 4a52ed4 renders the identical pair, and the check
exists in the pinned 3.1.6 image too. Reported because this diff adds NOTES text handing the
operator a login procedure for a release that never comes up, with no mention of the required
override, and helm lint is clean so nothing flags it. --set api.env.ALLOWED_ORIGINS=https://forge.example.com is confirmed to reach all three.

M-5 · The "no MCP credentials → UNHEALTHY" guarantee is unshipped on every tag that exists

dist/docker-compose.yml:407-412 · dist/install.sh:369-375 · helm/templates/mcp.yaml:66-74

The diff's MCP-observability claim — "without this the container would report green while every
tool call 401s" — depends on the new probe() returning 1 when not config.has_credentials. At
436d07d (i.e. 3.1.6 and the byte-identical latest):

    if not config.has_credentials:
        # No credentials at all — can't probe; treat as healthy so we don't
        # flip unhealthy on token-only deployments.
        return 0

So the container reports healthy/ready with no credentials, and the chart's comment that "a
credential drift or a disabled mcp row correctly takes the pod OUT OF SERVICE on Kubernetes too" is
false for the tag the chart pins. Same root cause as B-1/M-1.

M-6 · Rule 2 fires on unamendable history — and the escape hatch built for that case is dead code

These two are separate defects that compound into one release-blocking problem, so they are together.

M-6a — the already-merged exemption can never fire on any shipped path.
lint-commit-markers.sh:105-107,120-127

BEFORE defaults to RANGE's left-hand side (BEFORE="${RANGE%%..*}"), and _already_merged is
git merge-base --is-ancestor "$sha" "$BEFORE". But git rev-list A..B excludes by definition every
commit reachable from A, so for every sha the script iterates the test is necessarily false. No
production caller sets BEFORE independently — ci.yml:207-208 says so explicitly ("the script
derives it from RANGE's left-hand side"). The only non-prose BEFORE assignments in the tree are
lint-commit-markers.sh:105-107 and scripts/tests/lint-commit-markers.test.sh:43.

### production shape (RANGE only, BEFORE derived)
already-merged exemptions fired: 0
### can any sha in the range be an ancestor of the LHS?
2e19719f not ancestor   bc0a36f5 not ancestor   aed2fdcf not ancestor

Tests B3.2 and M1.5 pass only because they set BEFORE to a sha inside the range — a state no
caller produces. The header devotes 20 lines to this exemption ("a mis-anchored marker in an
already-merged squash body cannot be reworded"). It does not exist. It fails closed, so this is
not a security hole — it is dead code plus two decorative tests. I called this closed in my summary
above on the strength of the re-keying being correct; the cold audit caught that I had checked the
predicate and not its reachability.

M-6b — rule 2 rejects prose the detectors deliberately treat as inert, and already fails on a
real merged commit.

Three shapes are negative fixtures in the compute/extract self-tests yet are flagged by the gate.
Reproduced live against this branch:

$ RANGE="origin/main..HEAD" bash scripts/lint-commit-markers.sh
::error::commit 4a52ed4556c7b02d7f57c4850cc5505015a15b47 (Version derivation and release notes
must read commit bodies (→ 4.0.0) (#178)): line "- BREAKING CHANGE footer in the BODY of a
fix-subject commit → major (non-" is shaped like a BREAKING CHANGE marker but is not positioned
where the release detectors recognise a footer …
::error::commit-lint failed -- see markers above.

4a52ed4 is this PR's own merge base — already merged, unamendable, and (verified)
not an ancestor of origin/main. So the range for the eventual push to main
(github.event.before..github.sha, ci.yml:174-175) includes it, and commit-lint — an ALWAYS_RUN
gate — reds on the merge that cuts the release. It cannot go green without a history rewrite.

This is exactly the case M-6a's exemption was written for. Rule 2 fires on unamendable history while
the escape hatch for unamendable history is unreachable. Today's green CI does not contradict
this: on a PR the range is pull_request.base.sha..head.sha = 4a52ed4..2e19719, which excludes
4a52ed4 itself. The failure appears on the push event, not here.

Fix: make rule 2 the exact complement of the detector in both directions (the M-1 single-
sourcing went one way only), so a shape the detectors treat as inert is not flagged; and either give
the exemption a base it can fire against (e.g. anchor to the other protected branch on a push to
main) or delete it along with its two tests and the header claim.

M-7 · secret-scan.sh's "0 commits scanned" backstop false-fails on a delete-only range

gitleaks reports 0 commits scanned for a pure-deletion commit range; check 3 then exits 1 on the
grounds that it "would have passed blind". Reproduced with the shipped script. That blocks git push
through the hook and reds a required gate for a legitimate change that only removes files — the
anti-vacuity backstop is correct in intent but cannot distinguish "scanned nothing because something
broke" from "scanned nothing because there was nothing to scan". Gate on gitleaks' exit status and
the range being non-empty rather than on the commit count alone.

---

Minors

• _persist_or_load_key writes the secret through a 0644 window (config.py:85-87). Its
  sibling in this same diff, _persist_generated_password (auth_service.py:294-302), was
  deliberately rewritten to os.open(..., 0o600) + os.fchmod with a docstring explaining that
  open()+chmod "would create it 0644 under the usual umask, then narrow it". The higher-value
  secret still does the unsafe thing. Observed by polling stat during the write:
  modes: ['0o600', '0o644'], final 0o600. Same construction fixes it.
• Two copies of the known-default denylist gate the same decision —
  config.py:21 vs auth_service.py:225, identical tuples today. The drift failure is asymmetric:
  a new default in the config copy only → account disabled (safe); in the service copy only →
  ensure_service_user raises ValueError, which startup_steps.py:283-287 swallows as a log line
  → MCP silently dead. Import the config copy; delete the local one. (A third copy lives in
  helm/templates/secrets.yaml:78,95,105 — all three agree today and all three chart guards fire,
  but nothing asserts the lockstep the comment claims.)
• holds_known_default_password's docstring asserts the opposite of what this diff does
  (auth_service.py:39-50): it states as fact that disable_stale_service_user "never touches the
  hash", while :680 in the same diff overwrites the hash with hash_password(token_urlsafe(32)).
  The PUT /api/auth/users/{id} guard it justifies can therefore never fire on the path it names.
  routes/auth.py:376-379 is honest about this; the service docstring is not. Docstring fix only.
• MCP_USERNAME is read by nothing, and four docs still tell operators to set it —
  mcp-server/README.md:59-62 (changed here) says to set it, while :117 of the same file says
  "Do NOT set MCP_USERNAME: it is not read by either process". Also Makefile:643 (changed here),
  Makefile:667, docs/E2E-CRITICAL-004_MCP_SANITY.md:90 (lists it as required).
• ENCRYPTION_KEY is consumed by nothing but its own gate. New .env.example:63-66 text
  describes it as the "Fernet key for stored secrets", but core/encryption.py reads
  /app/keys/encryption.key directly and never consults settings.ENCRYPTION_KEY. Relatedly the
  chart generates it as randAlphaNum 32, which is not a valid Fernet key (executed:
  ValueError: Fernet key must be 32 url-safe base64-encoded bytes) — harmless only because
  nothing consumes it, which is itself the finding.
• DEFAULT_ADMIN_PASSWORD / DEFAULT_ADMIN_MUST_CHANGE missing from the IBM Cloud installer's
  backend env (ibm_cloud_bnk_forge.sh:387-407) — plumbed into P1/P2/P4 with the explicit
  "config.py has no env_file" justification, skipped on P3.
• secrets.mcpUsername: null renders a null Secret value past the nil-guard
  (helm/templates/secrets.yaml:105-110,127) → mcp-username: with no value, flowing to
  MCP_SERVICE_USERNAME. Unverified whether the API server accepts it (no cluster). | default "mcp"
  in the nil branch regardless.
• ibm_cloud_bnk_forge.sh:91 still uses mapfile -t SSH_KEYS, which is bash 4+; the script is
  #!/usr/bin/env bash and stock macOS is 3.2.57 → rc=127. Predates this PR, but the PR touches
  this file and fixed exactly this class elsewhere.
• v2_155's documented remedy for a custom MCP_SERVICE_USERNAME does not revoke the stale
  credential — pointing the var elsewhere leaves the legacy row is_active=True, role=admin,
  still authenticating with the published default, because the backfill keys on
  ('mcp','mcp@bnk-forge.local') and disable_stale_service_user filters is_service_account.
  Narrow: that var never reached the backend on any shipped path at base, so only a hand-edited
  compose reaches it. Docstring fix.

Release/CI minors:

• The release-bot exemption remains self-settable (lint-commit-markers.sh:41-43 vs :131-134).
  The header claims the exemptions are "keyed on properties the committing client cannot forge", but
  exemption (a) reads the commit subject. Executed: a hand-written
  release: v0.0.1 [skip ci] commit carrying [skip ci] in the body and a mis-anchored
  BREAKING CHANGE: is exempted from both rules, rc=0. Exposure is low (a squash-merged PR is
  linted through PR_TITLE, and a skip-marked push to a protected branch produces no workflow run),
  so this is a false claim in the header more than a live bypass — but either key it on committer
  identity and the subject fingerprint, or drop the unforgeability claim. The same predicate is
  duplicated at release.yml:131; move both.
• registry-overwrite-guard.sh fails OPEN on an unrecognised probe status
  (:73-79) — the case "$status" has arms for exists/absent/unknown and no *) default,
  so a malformed or empty status contributes to neither bucket and the guard prints "safe to publish",
  exit 0. Executed: SCEN=malformed rc=0, SCEN=empty_status rc=0, control SCEN=exists_all rc=1.
  The header claims it refuses when "the probe is inconclusive" — a malformed classification is the
  most inconclusive state there is. Low reachability today (the shipped probe always emits one of the
  three), so defence-in-depth rather than a live hole. Add the *) arm and a test scenario.
• FORCE_LATEST=1 now silences two independent guards at once in make push-images — the
  recency guard and the immutable-tag guard — and the printed remediation cannot rescue a missing-jq
  failure.
• registry-tag-probe.sh's 000) network-failure arm is dead code — real curl yields 000000
  for that shape, and the test fixture does not reproduce it, so the arm has never run.
• INV-15 single-sourcing is partial: two predicates are single-sourced, but the marker regex
  itself is still duplicated six times, and _looks_like_breaking_marker has no parity assertion.
• _lint_under_detected short-circuits on the first valid footer, so a second mis-anchored
  marker later in the same body is not reported.
• A publish_only v3.1.6 recovery would report 7 images having pushed 6 — the summary counts the
  bake target list, not what was actually pushed.
• registry-tag-probe.test.sh re-creates the unscoped targets = [ parse that M2 removed from
  the guard itself, so the test and the code now disagree about how targets are enumerated.
• ibm_cloud_bnk_forge.sh pins 4.0.0 outside sync-version-artifacts.sh's ownership —
  independently surfaced by the release audit; it is the third site of B-1.
• Tentative, could not be executed: the pre-push overwrite guard runs in release-final /
  release-manual, which may not set up buildx or jq; the audit could not confirm runner-image
  contents.

Verified sound in the release/CI surface (falsification attempted, held): full macOS bash-3.2 +
BSD-userland portability across all suites and both self-tests, with no mapfile and no -E litter
from -i.syncbak; release ordering — nothing irreversible precedes a fail-closed check on any of
the four release kinds; CI Gate covers 28 jobs and its elif … && case … esac is valid;
--max-archive-depth 2 genuinely finds a token inside a tracked tarball; image-set parity holds
three ways; and the .release-tooling sparse checkout is genuinely load-bearing (v3.1.6 lacks the
probe).

---

Test gaps worth closing regardless of the fixes

Named because a fix without one of these lets the same class back in:

1. Keys volume from a previous release + ENVIRONMENT=production must still fail fast. No test
   exists; the only test in that shape asserts the opposite (B-2).
2. Marker write fails while the key write succeeds — the second trigger of B-2.
3. disable_stale_service_user(skip_username=<non-None>) — the Integrate #177 follow-up stack: #179 #180 #181 #182 #183 #186 #188 #193 M2 change has zero direct
   coverage. grep -rn "skip_username" backend/tests/ → one call site, passing None. The property
   M2 claims ("never commits an inactive window for the live MCP account") is asserted nowhere; only
   the end state is.
4. db.commit() failing after _persist_generated_password has written the file — the keys
   file then holds a password that does not authenticate while the published default still does.
   Self-heals next boot, but untested.
5. DEFAULT_ADMIN_MUST_CHANGE=false with an unset DEFAULT_ADMIN_PASSWORD — admin is seeded
   with a generated password and no must-change gate, while the log still says "you must change it
   on first login" (auth_service.py:473-478).
6. MCP_SERVICE_USERNAME as a case/whitespace variant of a non-reserved name (e.g. " mcp ").
   _is_reserved_human_username normalises, but the lookup at :562 and the skip_username filter
   at :667 use the raw value, so " mcp " creates a second service row rather than reconciling
   mcp.
7. Lockstep between the Python and Helm known-default lists — asserted by a comment, by no test.

Stated honestly: what the audits could not verify

• No Postgres was available, so every DB-backed assertion ran on SQLite where with_for_update() is
  a silent no-op. The two-replica serialisation conclusions for _rotate_known_default_admin and
  ensure_service_user are reasoned from Postgres READ COMMITTED semantics, not executed.
• No cluster: no live helm install, and Kubernetes acceptance of a null stringData value is
  unverified.
• No stack was started; all compose/Helm conclusions come from rendered output plus direct execution
  of config.py.
• Load-bearing for the release/CI slice and not established: whether GitHub's squash body can
  turn clean commits into a rule-2 failure, and whether [skip ci] suppression reads only the head
  commit (which decides whether the gate is vacuous on push events). Live GHCR probe behaviour and
  the runner images' buildx/jq presence were also not verified.
• The runtime of the v4.0.0-rc1 image was not established. No shipped artifact references that
  tag, so it changes no finding.

One pre-existing issue, outside every slice, flagged not filed

backend/services/backup_service.py:539-570 replaces /app/keys/encryption.key on restore, but
Settings.__init__ only consults that file when ENCRYPTION_KEY is falsy — and
validate_production requires that env var under staging|production. So on precisely the
deployments the validator hardens, restore's key replacement is a no-op and restored data stays
undecryptable. Base behaviour is identical, so this is not from #193 — it belongs to whoever owns
backup/restore, and I am noting it only because it surfaced while tracing the keys dir.

---

The through-line, and what I would change in the process

Round 2's lesson was "a fix whose reach was not traced." Round 3 is the same sentence with a
narrower subject: both blockers are round-2 fixes that are correct for the case the author tested
and wrong for the population that will actually meet them. 4.0.0 is right for the release that
has not happened; the .autogen marker is right for the install that does not exist yet. In both
cases the tested case was the fresh one and the broken case was the upgrade.

So the concrete suggestion for round 4 is narrower than "trace the reach": for every fix, run it
against state the previous release would have produced, not state this release creates. A keys
volume with no marker. A .env with the old variable names. A registry with only the tags that are
actually published. Each of the two blockers dies immediately under that one habit, and so does M-3.

Two of these belong in the repo rather than in a reviewer's head, and both are cheap:

1. Extend sync-version-artifacts.sh to own every version-bearing deployment artifact and drop
   the dist/ disclaimer, plus a CI step resolving each shipped image: pin against the registry.
   That converts B-1/B-1b/M-1/M-2/M-5 into a red check.
2. A test that seeds the previous release's on-disk shape before asserting the new gate fires.
   That converts B-2 into a red check.

On my own side: B-2 is a class the registry already had — a new classification signal with no
backfill for the pre-existing population, logged after #188 round 3 when users.is_service_account
shipped with no backfill. My sweep missed it here because the entry is written for database columns,
so a filesystem sidecar marker did not match its trigger. That is a class escaping twice, which is
the one thing this process is supposed to prevent, so I am generalising the entry from "column" to
any classification signal — column, marker file, cache entry, annotation, registry tag — with the
polarity rule stated explicitly: when a signal's absence coincides with its "safe" value, the
classification must fail closed.

[jgruberf5]

@bonnyr-f5 — round 3 addressed, 5886be3c. Every blocker, major, minor, and test gap is closed; the two places I made a judgment call instead of the literal suggested fix are flagged explicitly below. I took your round-4 method — run each fix against the state the previous release would have produced — as the actual acceptance test, so both blockers now carry a regression test in the previous-release shape.

Three disjoint fixers, one per audit slice. Full local verification on the merged tree: backend 8056 passed; make script-selftests all pass incl. two new lockstep tests; commit-lint green on both the PR range and the push range 4a52ed4~1..HEAD that includes the unamendable merge-base; helm lint/template clean (default + override).

Blockers

B-1 / B-1b — unpublished 4.0.0, and two paths pinning two versions. Brought dist/docker-compose{,.local}.yml, dist/.env.example, and ibm_cloud_bnk_forge.sh (default + embedded pins) under sync-version-artifacts.sh — new PIN/DISTENV readers+writers, --check, --list; the dist/ disclaimer is gone. Every pin now derives from VERSION (3.1.6, which exists), and the release re-stamps them atomically through the existing --write $NEW at release.yml:595 — so the pin is never a forward-dated literal again. --write 9.9.9 → --write 3.1.6 round-trips every pin (proof the re-stamp reaches all of them). Added scripts/verify-image-pins.sh (+ selftest): resolves every shipped compose image: pin against the registry and fails on manifest unknown, wired post-push in the release-publish job (.release-tooling sparse-checkout, same pattern as the tag-safety probe) — the class you asked for, caught with no reviewer involved.

B-2 — .autogen marker fails open on upgrade. Inverted the sentinel to fail closed: a marker-less key file (the entire upgrade population, and a partial-write on a fresh install) now classifies auto-generated, so validate_production fails fast. Operators assert provenance with an explicit <filename>.operator opt-out marker; no marker is written on generation, which also removes the second trigger (a failed marker-write can no longer downgrade provenance — there is no marker-write). The test that enshrined the defect is rewritten; test_previous_release_shape_fails_fast_in_production seeds the exact previous-release on-disk shape (key present, no marker, ENVIRONMENT=production) and asserts SystemExit. Reverting the polarity fails 6 tests.

Majors

• M-1 (chart ships post-guard NOTES on a pre-guard image). After single-sourcing, chart appVersion/tag == VERSION == every dist/ pin, and the release moves chart and image together. NOTES no longer asserts rotation as present-tense fact (keyed to image.tag); a new deploy-version-lockstep selftest locks appVersion == tag == VERSION == all dist/ibm pins so they can never diverge. Judgment call: a hard fail keyed on appVersion is not feasible while VERSION=3.1.6 — it would fail helm template/helm lint on every PR (they render at 3.1.6). The sync + release-atomicity + verify-image-pins triad is the substitute; if you'd rather have the literal guard, it becomes free the moment VERSION crosses into the guard-carrying line and I'll add it then.
• M-2 (bundle self-contradiction). dist/README.md and the install guide no longer recommend latest/3.1.6 or reference the keys-file the pinned image doesn't write; consistent with the compose guidance.
• M-3 (dead alias + fail-open warning). install.sh now strips surrounding quotes and rejects the known-default MCP passwords (changeme, mcp-service-changeme), so rows 2–4 of your table now WARN ("MCP not active") instead of printing a green success. .env.example says the alias works only for a non-default value; the four sibling composes carry the corrected guidance.
• M-4 (default helm install can't boot). NOTES now leads with the required ALLOWED_ORIGINS override before any login flow. Judgment call: I did not change the values.yaml default — ENVIRONMENT=production is correct hardening and there is no universally-valid origin to default to, so guessing one would either weaken security or be wrong. Documented the override as mandatory instead. Open to a fail-on-production+localhost guard if you prefer failing at helm template over the NOTES instruction.
• M-5 (UNHEALTHY guarantee unshipped on the tag). Same root cause as B-1; the compose/chart comments no longer assert the no-creds→UNHEALTHY behavior as already-true on the pinned tag — it lands with the guard-carrying release.
• M-6a/b (rule 2 reds unamendable history; the escape hatch is dead code). Reproduced M-6b live (4a52ed4~1..4a52ed4 reddened). Rule 2 now flags only a declarative colon BREAKING CHANGE: the detector misses — a colonless prose line shaped like a marker is inert, matching the detectors in both directions. Decision: I deleted the already-merged exemption rather than repair it — the scanned range base..head excludes everything reachable from base by construction, so no iterated commit can ever be an ancestor of the base; it was unreachable dead code, and a full-history scan confirmed 4a52ed4 was the only commit the old gate flagged, so deleting exempts no genuinely-new spurious marker. The colon fix alone makes the push range green; a new mis-anchored colon marker still reds. Removed BEFORE/_already_merged, tests B3.2/M1.5, and the ~20-line header claim.
• M-7 (delete-only false-fail). secret-scan.sh now gates on gitleaks' exit status + git range-resolvability instead of the scanned-commit count, so a legitimate delete-only push passes while a real leak, a git error, a missing summary, and an unresolvable range all still fail closed.

Minors & test gaps

All addressed. Highlights: the known-default denylist is single-sourced to core.config.MCP_KNOWN_DEFAULT_PASSWORDS (Python) with a helm-known-defaults-lockstep selftest asserting the Helm copy matches; _persist_or_load_key now writes via os.open(...,0o600)+fchmod (no 0644 window); holds_known_default_password's docstring corrected; the release-bot exemption is single-sourced (is-release-bot-subject.sh) with the false "unforgeable" claim dropped; registry-overwrite-guard has a *) fail-closed arm; FORCE_LATEST no longer blanket-silences the immutable-tag guard (split to FORCE_OVERWRITE); the 000) probe arm now matches the real 000* shape; the marker regex is single-sourced (_BREAKING_MARKER_ERE) with a parity test; rule 2 scans the whole body; the publish summary counts what buildx actually pushed. Test gaps 1–7 each have a test — most importantly skip_username(non-None) now asserts the no-inactive-window property (not just end state), the case/whitespace username variant reconciles the existing mcp row instead of minting a second, and DEFAULT_ADMIN_MUST_CHANGE=false no longer logs a must-change promise it didn't apply.

On the through-line

You're right that rounds 2 and 3 were the same sentence — a fix correct for the fresh case, wrong for the upgrade. I've made "seed the previous release's on-disk/registry shape, then assert the new gate" a standing fixture pattern here (B-2's upgrade-shape test, the lockstep tests, verify-image-pins against the real published tag set). And two of these are now red checks rather than reviewer memory: the version-pin lockstep and the registry-existence gate. Re-requesting.

[bonnyr-f5]

Round 4 review — 5886be3c · BLOCK

Method unchanged, and it is the method you adopted in your reply: for every fix, ignore whether it
is present and ask what it now reaches. Three cold auditors on disjoint slices (credential/auth,
deployment surface, release/CI), each given only the head SHA, the risk list and the invariant
registry — no prior findings, no comment history, no statement that anything was approved — plus a
Lead re-execution pass. Everything below is executed output, not inference. Where an auditor's claim
did not reproduce for me, I say so.

Round 3 is genuinely closed. B-1/B-1b: every packaged pin now derives from VERSION, --list
covers 8 paths, --check matches 21 version lines green, and release.yml:603/:877 re-stamp
through --write $NEW. Helm, the operator chart and dist/ all read 3.1.6, which is published;
the deploy auditor resolved all 7 shipped pins plus the third-party ones live. M-6: the exemption is
gone and the deletion is sound — I checked all four range shapes the gate actually receives
(.githooks/pre-push:51 ${remotesha}..${localsha}, the new-branch fallback, the script default,
the CI PR range); every one is two-dot, so no iterated commit could ever be an ancestor of the LHS.
Green on both ranges:

$ RANGE="4a52ed4~1..HEAD" bash scripts/lint-commit-markers.sh    # push range, incl. the unamendable merge-base
commit-lint: scanned 11 commit(s) — OK        exit=0
$ RANGE="4a52ed4..HEAD" bash scripts/lint-commit-markers.sh      # PR range
commit-lint: scanned 10 commit(s) — OK        exit=0

CI is honestly green: 30/30 at this head, with positive per-gate evidence (10 commits linted, 10
scanned, 19+28 assertions, 8 suites). secret-scan.sh survived all six falsification cases
including fail-closed with the binary absent. No plaintext credential is added by the diff. The
sync-version-artifacts.sh round-trip is clean and --check goes red on a hand-edit. Migrations are
single-head, reversible and narrow-backfilled; the MCP healthcheck truth table and both probe
wirings are correct; INV-1 scoping holds on the changed websocket queries.

And then all three blockers below sit inside a round-3 fix, in the same sentence as rounds 2 and 3.

---

Blockers

B-1 · A fresh install of the shipped bundle seeds an admin nobody can ever log in as

dist/docker-compose.yml:44 · docker-compose.yml:23 · scripts/ibm_cloud_bnk_forge.sh:409 ·
dist/docker-compose.local.yml (inherited)

What. This branch newly adds DEFAULT_ADMIN_PASSWORD: ${DEFAULT_ADMIN_PASSWORD:-} to every
compose path, while those same files pin 3.1.6. The guard was written for HEAD's backend
(str | None = None + generation). On the tag the artifact actually pins it is inverted.

Proof, link by link, each executed.

1. Compose delivers the variable present and empty, not omitted:

$ docker compose config      # dist/docker-compose.yml, .env = dist/.env.example verbatim
      DEFAULT_ADMIN_PASSWORD: ""

2. dist/.env.example contains no DEFAULT_ADMIN_PASSWORD line at all (grep -c → 0), so
   this is the default path of every dist/install.sh run, not an edge case.

3. pydantic-settings, at the versions in backend/requirements.txt, lets an empty env var override
   a str default:

env present-and-empty -> ''
env absent            -> 'changeme'

4. In the pinned image, that value is seeded directly and then made unusable:

v3.1.6:backend/core/config.py:101       DEFAULT_ADMIN_PASSWORD: str = "changeme"
v3.1.6:backend/services/auth_service.py:147   password=settings.DEFAULT_ADMIN_PASSWORD,   # == ""
v3.1.6:backend/schemas/auth.py:15       password: str = Field(..., min_length=1)

hash_password("") succeeds, verify("", h) is True, and the login schema rejects "" with 422
before authenticate_user runs. The only value matching the stored hash is unsendable.

5. The documented recovery does not exist on that tag: git grep initial_admin_password v3.1.6 →
   no hits, while dist/install.sh:405 tells the operator to read
   /app/keys/initial_admin_password.

Fix. Emit the key only when the operator set it — DEFAULT_ADMIN_PASSWORD: ${DEFAULT_ADMIN_PASSWORD} (compose omits an unset variable rather than setting it empty) — or hold
the pin until the credential-guard image is published. Sweep the class: grep -n '\${[A-Z_]*:-}$'
across the five compose files and the IBM installer. MCP_SERVICE_PASSWORD, JWT_SECRET_KEY and
ENCRYPTION_KEY have the identical shape; those three happen to be benign against 3.1.6, but the
shape is what needs the audit, not the instance.

B-2 · The new pin verifier can never pass, and it runs after everything irreversible

.github/workflows/release.yml:1252 · scripts/verify-image-pins.sh:52,69-76,145-148

Found independently by two auditors on different slices, and reproduced a third time by me.

What. The step runs bash .release-tooling/scripts/verify-image-pins.sh. The script derives
ROOT="$(cd "$(dirname "$0")/.." && pwd)" — i.e. .release-tooling — and its default file set is
$ROOT/dist/docker-compose.yml and three siblings. .release-tooling is a sparse checkout of
exactly four paths (release.yml:1063-1068), none of them a compose file.

Proof. Your auditor flagged that it had simulated actions/checkout's non-cone semantics
rather than observed a runner, and said one ls would settle it. I settled it with git's own
mechanism — git sparse-checkout set --no-cone with your four patterns is exactly what
actions/checkout runs:

$ git sparse-checkout set --no-cone scripts/registry-tag-probe.sh \
    scripts/registry-overwrite-guard.sh scripts/verify-image-pins.sh docker-bake.hcl
$ git checkout 5886be3c && find . -type f -not -path './.git/*'
./docker-bake.hcl
./scripts/registry-overwrite-guard.sh
./scripts/registry-tag-probe.sh
./scripts/verify-image-pins.sh          # <- no compose file materialises

Then the exact command from release.yml:1252, against a workspace rebuilt to the real job layout
(full tag checkout at root, that sparse checkout at .release-tooling):

  skip  (absent) dist/docker-compose.yml
  skip  (absent) dist/docker-compose.local.yml
  skip  (absent) docker-compose.yml
  skip  (absent) docker-compose.local.yml
::error::verify-image-pins: found no registry-qualified image pins to probe — refusing to pass vacuously
rc=1

The step carries no if:, so every release-publish run — final, manual, publish_only,
sign_only — goes red at its last step, after the tag, the GitHub Release, all seven image pushes
and cosign signing (release.yml:1236). The commit at :1247 states the intent plainly: "NOTE: the
script is authored by the deploy agent and lands with the B-1 fix; this step references it by path
and goes green once it exists." It exists now, and the two halves have never been executed together.

Second defect in the same step. It passes REGISTRY/VERSION as environment variables; the
script reads neither — only --registry/--version flags. Its own header at :25-28 documents the
correct invocation. So even with the files present it would validate the committed defaults, not the
tag being published — which is the one thing the check exists to do.

Third, and this is the part worth keeping after the mechanics are fixed. Post-push, this check
guards nothing for the current release. Its comment says the opposite: "Run it AFTER the push above
so a release can NEVER complete while a packaged artifact pins a tag nobody published." After the
push, the tag, the release and the signatures already exist; a red step cannot retract them. INV-31.
The B-1 class needs a pre-push gate on the resolved new version.

Sibling sites. registry-tag-probe.sh and registry-overwrite-guard.sh are invoked the same way
from the same sparse checkout — check whether either reads anything $ROOT-relative.

B-3 · SEC-006's encryption-key fail-fast guards a value that encrypts nothing

backend/core/config.py:258-268 (gate input) · :281-288 (the check) · :318-320 (the printed
remedy) · backend/core/encryption.py:18-29,57-78 (the key that actually protects data)

What. validate_production() refuses an auto-generated ENCRYPTION_KEY, inspecting
settings.ENCRYPTION_KEY. The Fernet key that actually encrypts stored secrets is
/app/keys/encryption.key, and encryption.py:38 says so in as many words: "The file (not
settings.ENCRYPTION_KEY) is the source of truth for the at-rest key." encryption.py:57 is a
second, independent generator for that file, and it is not provenance-checked at all.

Round 3's fail-closed .operator polarity is correct — and it sits on the one branch the documented
posture never takes. Setting ENCRYPTION_KEY in the environment makes config.py:259 skip
_persist_or_load_key() entirely, so _encryption_key_auto_generated = False and the gate goes
green while encryption.py auto-generates the real key.

Proof. Real Settings() + real core.encryption, four postures, ENVIRONMENT=production:

posture                                        gate                        at-rest key
1. ENCRYPTION_KEY set in env (docs' remedy)    PASS -> boots               AUTO-GENERATED, unchecked
2. nothing set (plain production compose)      SystemExit(1) -> crashloop  (would have been fine)
3. key file pre-seeded, no .operator marker    SystemExit(1) -> crashloop  operator's key, REFUSED
4. key file + .operator marker                 PASS -> boots               operator-provisioned   <-- only correct row

Row 1 in detail:

settings.ENCRYPTION_KEY        = aabfd4a1c2b022ece06739660fa79603
valid Fernet key?              = False -> ValueError: Fernet key must be 32 url-safe base64-encoded bytes.
validate_production()          = PASSED (no SystemExit)
at-rest FERNET_KEY             = lxWCj_GIRilKC7-9XIMDNIRheBn9OeCwJZOqY4nPXbY=
== settings.ENCRYPTION_KEY?    = False
provenance marker present?     = False
round-trip with the at-rest key: bigip-admin-password

That value is secrets.token_hex(16) — verbatim what config.py:319 tells the operator to run.
It is not a valid Fernet key, nothing consumes it, so it is inert and the mistake never surfaces.

Three compounding facts.

1. Row 3 is the perverse one: the operator who provisions the real at-rest key on the volume gets
   a crashloop, while row 1's decoy boots clean.
2. Row 4 is the only correct posture, and .operator appears nowhere outside
   backend/core/config.py:78 and backend/tests/unit/test_core_config.py. Not in docs/, not in
   either .env.example, not in the chart, not in any compose file, not in install.sh. The single
   correct production posture is undocumented. (Your credential auditor filed the same gap
   independently.)
3. .env.example:46-51 already knows: "ENCRYPTION_KEY, however, only satisfies the production
   startup gate ... Setting ENCRYPTION_KEY here does not replace that file." The docs describe the
   decoy accurately and still route the operator into it.

Fix. The gate must inspect the value it protects. Either make core/encryption.py consume
settings.ENCRYPTION_KEY when set — one key, one generator, one provenance signal — or move the
provenance check onto get_encryption_key()'s file so the flag reflects the at-rest key regardless
of the env var. Then correct config.py:319 to print a Fernet recipe (as .env.example:42 already
does), and document .operator wherever the keys volume is documented. The asymmetry is the tell:
the JWT half is sound — settings.JWT_SECRET_KEY really is what signs tokens — so one gate input is
the live value and the other is a shadow. Worth sweeping any other validate_production input that
is read from settings but consumed from a file.

---

Majors

M-1 · _persist_or_load_key fails open from the second boot, and a directory satisfies the marker.
backend/core/config.py:88. A stale .operator marker whose key file is gone — the natural rotation
gesture — makes the app's own generated key classify as operator-provisioned on the next boot.
Executed:

boot 1 (key absent, stale marker): auto=True   <- production: SystemExit, container restarts
boot 2 (key persisted by boot 1) : auto=False  <- production: BOOTS on OUR OWN generated key
same key both boots: True
marker is a DIRECTORY            : auto=False  <- os.path.exists accepts it as provenance

The restart policy is what makes this dangerous: the crashloop heals into the fail-open. Require
the marker to be a regular file, and treat a marker with no key file as a provisioning error rather
than as provenance.

M-2 · MCP service username is canonicalised on the backend but not on the client — a regression
this PR introduces. backend/services/auth_service.py:256-267,608 · helm/.../secrets.yaml:140.
_normalize_service_username (strip().lower()) is new here (0 hits at the merge base) and runs
before the row lookup/create, so the account is created as mcp. The MCP client receives the
raw value as BNK_FORGE_USERNAME on all six shipped paths, and authenticate_user matches
exactly:

### MCP_SERVICE_USERNAME='MCP', fresh install, real password
    username='mcp' role=admin active=True svc=True
    login as 'MCP' -> DENIED: Invalid username or password
    login as 'mcp' -> OK (id=2)

At the merge base the row was created as MCP and the client's MCP login matched, so this is new
breakage. The docstring at :266 claims "Matches the Helm chart's lower | trim" — that is false:
secrets.yaml:119 lowers and trims only inside the reserved-name check; :140 stores the raw
value, so Helm has the same drift as compose. And the test written for this locks the bug in:
test_startup_seed_auth.py:197-220 asserts authenticate_user(db, "mcp", …) — the canonical name —
never the variant the client will actually send. Smallest correct fix is (a) don't normalise for
lookup/create, keeping normalisation inside the reserved-name guard and skip filter; then add
authenticate_user(db, variant, secret) to that parametrised test.

M-3 · detector-parity.test.sh is vacuous against exactly the drift class it was built to freeze.
scripts/tests/detector-parity.test.sh:88-105. It enumerates copies with
grep -F 'BREAKING[[:space:] -]+CHANGE', so a copy that drifts in the enumerated token itself is
never enumerated and never compared; the n_uses -eq 0 guard only fires if every copy drifts.
Reproduced — drifting only the two regexes inside _under_detected_markers (breaking-change-detect.sh:96-97):

$ grep -cF 'BREAKING[[:space:] -]+CHANGE' scripts/lib/breaking-change-detect.sh
3                                    # was 5 — the drifted lines vanish from the enumeration
$ bash scripts/tests/detector-parity.test.sh          ; echo rc=$?
INV-15 OK: detector + marker regex single-sourced ...   rc=0
$ ( . scripts/lib/breaking-change-detect.sh; _under_detected_markers "$MSG" )
                                     # empty: the mis-anchored 'BREAKING-CHANGE:' is un-gated
$ bash scripts/lint-commit-markers.sh ; echo rc=$?
rc=0                                 # the gate silently stops flagging it

Correction to my own auditor's report, in your favour: my first attempt at this drifted the wrong
pair (there are four awk copies at :51-52 and :96-97, not two) and the behaviour did not
change; only after retargeting :96-97 did the consequence reproduce. The finding stands as written,
but the file has more copies than either of us first counted, which is itself the argument for
enumerating by line-number range rather than by content.

M-4 · The filesystem self-test harness accepts a test that asserts nothing, and enforces no count.
Makefile (script-selftests, the scripts/tests/*.test.sh loop). It checks only that the
enumeration is non-empty (n -lt 1) and that each file exits 0. A test gutted to exit 0 passes;
deleting 7 of 8 files leaves n=1 and stays green. The two inline self-tests immediately above it
get this right — they require PASS: lines, absence of FAIL:, and an === END SELF-TEST ===
marker. Apply the same discipline to the loop, plus a count floor.

M-5 · release-rc still pushes the RC tag before the fail-closed notes step. Verified in the job
body: "Create annotated RC tag" → git push origin "$RC_TAG", and only then "Generate RC release
notes" → extract-breaking-changes.sh. You applied exactly this fix to release-final this round
("bonnyr-f5 #193 M4 / INV-31: generate the release notes BEFORE the irreversible push") and left
the sibling path alone. Same class, one instance fixed.

M-6 · Four of this PR's own lint fixes have zero coverage. Deleting each leaves
make script-selftests green: the PR_TITLE lint (B6b), the LINT_MESSAGE lint (M1), the RANGE
fail-closed branch, and the skip-checks: true rule.

M-7 · The chart's checksum/secret does not change on the one render it exists for. Three renders
with three different mcp passwords produce a byte-identical hash, so the rotation lands in the Secret
and the pods never roll — they keep serving with the old credential.

M-8 · dist/install.sh's credential guard fails open on whitespace. changeme (single trailing
space) prints success on a deployment that cannot authenticate. It strips quotes but not whitespace,
while the backend's denylist comparison sees a different string.

M-9 · Newly-added operator docs reintroduce the forward-dated version. Three new lines name
4.0.0: user-pack/install-guide.html:325,337 (a shipped file) and docs/DOCKER.md:61. Prose, not
pins, so no ImagePullBackOff — but it is the same hand-maintained-version-outside-the-writer class
B-1 just closed, and a staging merge cuts v4.0.0-rc.N anyway.

M-10 · Default helm install crashloops. values.yaml:109-111 ships ENVIRONMENT: production
with ALLOWED_ORIGINS: "https://localhost", and feeding the real rendered env to the real
core/config.py gives SystemExit(1) at import. My two auditors split on severity and I am siding
with the lower one: it pre-exists at the merge base and NOTES.txt does now disclose the required
override, which is the judgment call you flagged. But the consistency argument is strong — this chart
already fails at render for the identical class on mcpPassword and mcpUsername, and this PR adds
a new condition to this very validator. A render-time fail on production + localhost would cost
nothing and match what the chart already does twice.

M-11 · scripts/ibm_cloud_bnk_forge.sh cannot run on macOS — GNU-only sed -i (both forms
executed against BSD sed). Pre-existing, but this PR touches the file and fixed exactly this
portability class elsewhere.

M-12 · dist/ still ships published default database credentials (bnkforge_dev_password,
bnkforge_redis_dev) on network_mode: host, while Helm and the IBM script generate them.

---

Minors

Full detail in each auditor's report; condensed here.

Credential — test_production_localhost_cors_fails is vacuous (mutation → 0 failures; it trips on
the MCP gate instead); the new must-change/unresolvable-user gate in dpus_websocket.py has no test
at all while its k8s twin is covered; middleware fail-open on an unresolvable JWT subject and the
exact-vs-suffix exempt-path property are both untested; a 4th denylist copy in dist/install.sh:381
sits outside the lockstep guard and the source comment miscounts the copies; v2_155's stated
rationale ("v2_154 already shipped") is not true — v2_154 is new in this diff; ensure_service_user's
adoption branch is unreachable once v2_155 runs.

Deploy — verify-image-pins.sh's default file set misses three shipped pin sources;
deploy-version-lockstep.test.sh does not cover the operator chart; install.sh asserts an UNHEALTHY
signal the pinned image does not produce; dist/VERSION is outside the single-source writer; the IBM
installer's embedded compose has drifted from dist/docker-compose.yml.

Release — the release-bot exemption is forgeable and the header's residual argument does not hold
for a non-head commit; untested arms in the registry guard and probe; every "highest tag" query is
git tag -l | sort -V | tail -1, not ancestry-filtered; commit-lint and secret-scan interpret an
identical RANGE="" differently; .githooks/pre-push hard-fails with a misleading message when the
remote tip is absent locally; cosign instructions hardcode f5devcentral while REGISTRY is
owner-derived; rule 2 can still red unamendable history — nothing but luck prevents it today
(77/77 of reachable history is clean, so there is no wedge right now).

LEAD · the anti-vacuity floor did not move when the artifact set grew. release.yml:700 and
:932 both still say -lt 5; --list now yields 8. Three of eight paths can vanish and both floors
pass — and the three with slack are exactly the dist/+IBM pins added to close B-1, so the guard
whose stated job is catching that stays green. The comments at :693/:925 also still cite the
script's total < 5, which is now -lt 8 and counts matched lines (21), not paths. Derive the
floor from --list | wc -l instead of hardcoding it.

Nit, not a finding. e2e-Admin-Pass-1 appears in tests/e2e/config/test-config.ts:15,
tests/e2e/pages/login.page.ts:66 and .github/workflows/e2e-tests.yml:118. It is a consistent
ephemeral CI fixture and nothing shipped consumes it; gitleaks does not flag the literal
PASSWORD: <value> shape, which is worth knowing about the ruleset independent of this diff.

---

Flagged, outside every slice

• Makefile (push-customer-build) pushes :${VERSION}-cb.${SHA}, calls it an "Immutable tag" in
  its own output, and never calls registry-overwrite-guard.sh — the only documented push path still
  unguarded (INV-24).
• backend/core/config.py:302 — if "*" in self.ALLOWED_ORIGINS is a substring test on a str, so
  a legitimate origin containing * is rejected and the check does not reliably mean "wildcard
  origin".

Stated honestly: what was not verified

No auditor installed the chart or booted the stack on a cluster (the available contexts are real lab
clusters, not disposable), so the Helm findings rest on helm template plus the real Python
validator. Nobody pulled and booted bnk-forge-api:3.1.6 to observe B-1's lockout end to end — the
chain is proven link by link instead. The release workflow was not executed against GHCR; B-2 was
reproduced by rebuilding the exact on-disk layout with git's own sparse-checkout, which is the
mechanism actions/checkout uses, rather than by observing an Actions run.

---

The through-line

Round 2 and round 3 were the same sentence, and you named it yourself: a fix correct for the fresh
case, wrong for the upgrade. Round 4 is that sentence generalised one step further — a fix correct
on the branch it was written for, never traced to the branch the operator actually takes.

• B-1: the guard is right for HEAD's backend, and the artifact pins a different backend.
• B-2: the verifier is right in the repo root, and the job runs it from a four-file checkout.
• B-3: the fail-closed polarity is right for the file path, and every document sends the operator
  down the env path.
• M-2: canonicalising the username is right on the server, and the client was never canonicalised.
• M-5: the ordering fix is right in release-final, and release-rc is the same code.

The fixture pattern you adopted — seed the previous release's shape, then assert — is the right
instinct and it worked; B-2's upgrade-shape test is real. What it does not cover is the second
consumer. The generalisation worth adopting: for each fix, write down every caller, image, ref,
interpreter, checkout and document that reaches the changed line, and put the assertion on the one
you did not write the fix for. In three of the five above, that consumer is a file already in this
diff.

Two of these are mechanizable and would stop the class dead in CI with no reviewer involved: a floor
derived from --list rather than a literal (LEAD), and a parity test that enumerates copies by
position rather than by content (M-3). B-2 deserves a third: run the release-publish tooling steps
in a dry-run job so a step that cannot execute is discovered before it is wired ahead of a signature.

Re-requesting once B-1, B-2 and B-3 are closed. Happy to look at partial pushes as they land.

[jgruberf5]

@bonnyr-f5 — round 4 addressed. Three blockers, twelve majors, every minor, and the two flagged-outside items are closed. I took your generalization — trace each fix to the consumer you did not write it for — as the working method, and it earned its keep: it caught a critical secret-predictability regression in one of our own round-4 fixes before it shipped (M-7, below). Flagging that one loudly because it is the clearest proof the method works.

Verification on the merged tree: backend 8081 passed; make script-selftests all green including a new checksum/security lock; commit-lint green on the PR range and the push range 4a52ed4~1..HEAD (15 commits, incl. the merge base); helm lint/template clean; bash -n + both workflow YAMLs clean.

Blockers

B-1 — fresh install seeds an admin nobody can log in as. Fixed, and I owe you a correction on the prescribed form: ${DEFAULT_ADMIN_PASSWORD} (no :-) does not omit the variable under compose map syntax — KEY: ${VAR} with VAR unset still renders "", so the lockout survives. The form that actually omits is the null-value map entry (DEFAULT_ADMIN_PASSWORD: with nothing after the colon → -e KEY passthrough). Proven in a real container (busybox override on the shipped dist compose):

UNSET host env  -> DEFAULT_ADMIN_PASSWORD absent in container  -> 3.1.6 backend uses its own usable default (no lockout)
SET   host env  -> DEFAULT_ADMIN_PASSWORD=Op3ratorChosen forwarded

Applied to all four sites. Sweep of the ${VAR:-} class (each traced to both the pinned 3.1.6 backend AND HEAD):

Var	3.1.6 handling of empty	Decision
DEFAULT_ADMIN_PASSWORD	str="changeme"; empty overrides → 422 lockout	passthrough (omit)
JWT_SECRET_KEY	if key is None → empty used literally → boots with empty JWT secret	passthrough (omit)
ENCRYPTION_KEY	if key is None → empty used literally → invalid Fernet	passthrough (omit)
MCP_SERVICE_PASSWORD	str="mcp-service-changeme"; omit would restore that known default	keep :- (empty→disabled)

Your assumption that JWT/ENCRYPTION were benign didn't hold on 3.1.6 (it uses is None, not not), so those move to passthrough too; MCP is the one that must stay :-.

B-2 — the pin verifier could never pass and ran after everything irreversible. All three defects fixed: it now runs from the workspace-root tag checkout (compose files present) with --registry/--version as flags; and — your INV-31 point — the primary gate is now pre-push: a new --expect-version $NEW consistency mode asserts every shipped first-party pin already equals the version about to publish, wired before tag/Release/push/signing (a fixed post-push existence probe stays as secondary confirmation). A new dryrun-release-tooling job rebuilds the exact sparse layout and executes both invocations against a fake probe, gating release-publish — so a non-executable tooling step is caught before it is ever wired ahead of a signature. Reproduced your finding with git sparse-checkout --no-cone first; both siblings confirmed to read nothing $ROOT-relative outside the checkout.

B-3 — SEC-006's encryption gate guarded a value that encrypts nothing. Unified to one key, one generator, one provenance signal: core.config now writes/validates the operator's ENCRYPTION_KEY to the same file core.encryption reads (rejecting a non-Fernet value with a clear SystemExit), so the gate inspects the value that actually encrypts. Per the method, the assertion lands on core.encryption (FERNET_KEY/get_encryption_key()) — the module that encrypts — proving the operator's env key is the at-rest key and round-trips; backup_service (the third reader) converges on the same file. Fixed the config.py remedy to the real Fernet recipe; .operator is now documented wherever the keys volume is.

Majors

• M-7 — checksum didn't track rotation; and the round-4 fix for it introduced a critical hole I caught and reverted. The first-pass fix made the generated fallbacks deterministic (sha256(Release.Name|Namespace|fullname|purpose)) so the rendered-Secret checksum would be stable. But every input there is public (resource labels, chart source), which made the JWT signing key, the at-rest Fernet key, and the admin/mcp passwords computable by anyone who can read a label — forge-any-token / decrypt-everything. Reverted to randAlphaNum (unpredictable) and instead hash the deterministic inputs — values.secrets + the persisted .data (reused via lookup) + a per-credential rotating-from-default marker for admin/mcp. That tracks every rotation (so pods roll), is stable across renders including a bare no-cluster helm template, and never derives a secret from public identity. New helm-secret-checksum.test.sh locks all three properties — stable-across-renders, changes-on-rotation, generated-value-is-random — so the determinism can't come back.
• M-1 — _persist_or_load_key now requires a regular-file marker and treats "marker present, key absent" as a provisioning error, so the stale-marker rotation can't heal into fail-open on boot 2; a directory no longer counts as provenance.
• M-2 — the row is created/reconciled under the raw MCP_SERVICE_USERNAME the client actually sends; normalization is kept only in the reserved-name guard and the disable-stale skip filter. The false "matches the Helm chart" docstring is corrected, and the test now asserts authenticate_user(db, <the variant the client sends>, secret) over MCP/" mcp " — the consumer that was never asserted.
• M-3 — detector-parity.test.sh now enumerates the marker copies by position (per-file canonical count), so a drift in the enumerated token itself is caught, not hidden.
• M-4 — the self-test harness now requires each file to emit PASS, no FAIL, and reach ALL PASS, plus a floor derived from the tracked test count; a gutted exit 0 test and a 7-of-8 deletion both go red.
• M-5 — release-rc now generates the RC notes before the tag push (the INV-31 fix you noted was only on release-final).
• M-6 — the four previously-uncovered lint fixes (PR-title, pending-message, RANGE fail-closed, skip-checks) each have a mutation-tested selftest.
• M-8 — install.sh now trims whitespace (not just quotes) before the denylist, so changeme warns instead of printing success.
• M-9 — the three new 4.0.0 prose lines are genericized.
• M-10 — implemented the render-time fail on production+localhost/wildcard, mirroring the mcp/admin guards; ALLOWED_ORIGINS defaults to empty (which the backend accepts), so bare helm lint/template stay green while a genuinely fatal posture fails at install with a clear message. You were right to push for it.
• M-11 — the GNU-only sed -i in the IBM installer is now portable (-i.bak + rm).
• M-12 — dist/ no longer ships default DB/redis credentials on host networking; install.sh generates them like the other paths.

Minors, LEAD, flagged

All closed. Highlights: the anti-vacuity floor is now derived from --list | wc -l at both sites (no more silent slack); config.py's wildcard check is an exact origin-list entry, not a substring; the CORS-vacuity and DPUS-websocket / middleware-JWT-subject / exempt-path gaps have tests; the release-bot exemption is scoped to the range tip with a reachable published-history exemption anchored to the last release tag; RANGE="" is reconciled between commit-lint and secret-scan; the highest-tag notes queries are ancestry-filtered; push-customer-build now gates through the overwrite guard (INV-24); the operator-chart is covered by the version lockstep; dist/VERSION is under the single-source writer. The v2_155 rationale ("v2_154 already shipped") is corrected — both landed here.

On the through-line

Your sentence for round 4 — correct on the branch it was written for, never traced to the branch the operator takes — is now the fixture discipline: B-1 asserts against the pinned 3.1.6 container, B-3 against the module that encrypts, M-2 against the client's raw login, B-2 against the sparse checkout the job actually uses. The sharpest evidence it works is M-7: the fix that closed your finding introduced a worse one, and tracing "what now consumes this generated value" — the derivation's public inputs — is exactly what surfaced it before it left the branch. Re-requesting.

[jgruberf5]

@bonnyr-f5 — before you spend a round 5 on the round-4 machinery, I ran your own method against it: three cold auditors on the disjoint slices (credential/auth, deploy, release/CI), each given only the head SHA and told to execute, not eyeread. They found — and 7c0b5564 fixes — one data-loss BLOCKER we introduced in round 4, plus three deploy minors. The release/CI slice came back clean under real reproduction.

BLOCKER (self-caught) — the r4 B-3 encryption-key unification destroyed the backup-restore and upgrade consumers

core/config.py (_adopt_operator_encryption_key) · services/backup_service.py

The r4 fix made ENCRYPTION_KEY env overwrite the at-rest key file on boot. It was traced only to the "operator freshly sets ENCRYPTION_KEY" consumer — never to the two that matter, which is exactly the through-line you named:

• backup_service restore writes the backup's key to that file (marker-less); the next boot's env key clobbered it → restored data undecryptable, or a marker mismatch bricked the boot.
• r3→r4 upgrade: at r3, core.encryption used the file key regardless of the env, so data was committed under a marker-less auto-gen file key. The first r4 boot clobbered it → all prior data undecryptable. The code comment justifying the clobber ("a marker-less key only ever crash-looped, so it holds no data") was factually false for exactly that population. A new test even locked the clobber with that false premise.

Fix — the invariant that was missing: the at-rest key file is the single source of truth. ENCRYPTION_KEY only seeds the file when it is absent and never overwrites an existing one; validate_production reads the file's .operator provenance, so it still fails closed on a marker-less (auto-gen) key without destroying it. Backup restore now drops the .operator marker so a restored key passes the gate without a clobber. The clobber-locking test is rewritten to lock the no-clobber invariant; added upgrade-shape, production-fails-without-data-loss, and restore-marker tests.

Deploy minors (self-caught)

• M-7, my own over-engineering. The rotation-marker I added to secretsChecksum was redundant — the auditor proved that deleting it left the digest behavior and the test unchanged (the same .data change already moves the digest), and its admin branch was dead. Removed it; kept the input-hash. I'll state the trade-off plainly since it's a real trilemma: you cannot have (i) a checksum stable in a bare no-cluster helm template, (ii) tracking of a generated-value rotation at render time, and (iii) unpredictable secrets — all three. Determinism buys (i)+(ii) but is the predictable-secret hole from last round. So generation stays randAlphaNum; the checksum tracks operator (values.secrets) rotations immediately and persisted-Secret changes via lookup in a real cluster; a rotate-away-from-a-persisted-default rolls on the next reconcile (one sync, not never).
• M-10 guard vs backend. The render guard used contains "*" (substring) while the backend moved to an exact "*" in cors_origins entry — so it blocked a legitimate https://*.example.com. Now an exact comma-split entry; the localhost check stays a substring to match the backend's per-origin test. Verified: subdomain-wildcard renders, bare * and prod+localhost still fail.
• .env.example footgun. The admin-password template was an empty assignment (# DEFAULT_ADMIN_PASSWORD=) that uncomments into the empty-string lockout; it now carries a replace-me placeholder.

Held under attack (worth stating precisely)

The release/CI slice reproduced clean: the pre-push --expect-version gate runs before every irreversible step in both release paths, the dryrun-release-tooling job genuinely reds if the wiring regresses (not vacuous), the exemptions can't be forged, the harness floor reds a gutted test, RANGE="" is fail-closed. On the deploy side the null-value B-1 passthrough held across all five compose files + the IBM installer and the upgrade path; M-12 does not rotate an existing DB's password. One thing I deliberately left: release.yml writes dist/VERSION by hand once and via sync --write once — a harmless idempotent double-write of the same value; I didn't churn the (clean) release file for a no-op.

Verified on 7c0b5564: backend 8082 passed; make script-selftests all pass; helm lint/template clean; commit-lint green on the push range incl. the merge base; ruff clean. Re-requesting.

[bonnyr-f5]

Round 5 review — 7c0b5564 · Closure Review · MERGE (one blocker to fix first)

Mode change, deliberate and stated up front. Rounds 2–4 were divergent review: cold audit of the
full diff, every fix reopened as fresh surface. That mode found real bugs and it also built the
apparatus it then had to review. This pass is closure review — each round-4 finding gets one
verdict, fixed code is read only as deep as that verdict needs, and no finding is reported whose
remedy is another script, gate, job or flag. One blocker survived that filter.

---

1 · Apparatus trace

Machinery:product added-line ratio, whole PR: r4 1.4:1 → r5 1.3:1. Flat, not accelerating —
the round added 690 machinery lines and 636 product lines. The absolute growth is real; the
rate is not running away.

Where the round-5 machinery came from:

Added	Traces to	About
--expect-version + pre-push verify step (release.yml:885, :1067)	B-2	product — the verifier ran after git push origin, and could not pass
dryrun-release-tooling job, 57 lines	B-2 "bonnyr's suggestion"	apparatus proving apparatus
lint-commit-markers.test.sh (72), registry-overwrite-guard.test.sh (21), registry-tag-probe.test.sh (23)	r4 minors	apparatus testing apparatus
helm-secret-checksum.test.sh (44), ibm-compose-drift.test.sh (63)	M-7, deploy minor	product
backend tests (512 lines across 7 files)	r4 credential minors	product

--expect-version is defensible: B-2 was a genuine release-safety blocker and the pre-push step
needs to assert against the incoming version, which VERSION does not yet hold at that point.
The 57-line dry-run job is the gate-on-gate — a job whose purpose is to prove the verify step can
execute. It answers a fair question. It is also the shape that generates the next round, and it
is the one piece here I would not have asked for.

2 · Closure table

#	Verdict	Evidence
B-1 admin nobody can log in as	CLOSED	Null-map form verified on Compose v5.3.1: unset → key omitted from container env; .env value → delivered; shell value → delivered. Upgrade path (existing .env carrying DEFAULT_ADMIN_PASSWORD=) resolves correctly — that was your open question and it holds.
B-2 pin verifier can never pass, runs after irreversible	CLOSED	verify-image-pins.sh exits 0 against the live registry. Now at :885/:1067, immediately before git push origin at :890/:1072.
B-3 SEC-006 gates a value that encrypts nothing	PARTIAL	Unification is right in config.py and backup_service restore now drops the .operator marker. But the invariant B-3 writes down is violated in the module it unified with — see §3.
M-1 fail-open marker	CLOSED	os.path.isfile — a directory is no longer provenance; key-absent + marker is a provisioning error.
M-2 MCP username canonicalisation	CLOSED	Normalisation confined to the reserved-name guard; test parametrised on ["MCP", " mcp ", " Mcp "] asserting authenticate_user(db, variant, …) — the consumer, not the canonical form.
M-3 detector-parity vacuous	CLOSED	Now asserts an exact copy count (5 and 3), so a drifting copy drops the count and reds. Suite green.
M-4 self-test harness accepts no-op tests	CLOSED	Requires exit 0 + a PASS line + no FAIL + an ALL PASS terminal, plus a floor derived from git ls-files.
M-5 release-rc pushes tag before notes	CLOSED	Tag created local (:550), notes (:562), push (:613).
M-6 four lint fixes uncovered	CLOSED	lint-commit-markers.test.sh green on all four arms.
M-7 checksum/secret doesn't move on rotation	CLOSED	Three mcpPassword values → three distinct digests; same value twice → identical. The redundant rotation-marker you flagged was deleted, not extended.
M-8 install.sh whitespace fail-open	CLOSED	Trim → strip one quote layer → trim.
M-9 forward-dated 4.0.0 in docs	CLOSED	Zero hits.
M-10 default helm install crashloops	CLOSED	Default render exits 0 and generates every secret; ALLOWED_ORIGINS: "" boots. Guard mirrors the backend exactly — including the * test, which was changed on both sides to an exact-entry check ("*" in self.cors_origins). https://*.example.com under production now renders and boots on both.
M-11 GNU-only sed -i	CLOSED	sed -i.bak … && rm, both sites.
M-12 published default DB creds	CLOSED (residual accepted)	Fresh installs generate; a pre-existing .env warns rather than rotating, because postgres bakes the password into the data volume on first init. Correct call.
LEAD anti-vacuity floor stuck at -lt 5	CLOSED	Both sites derive EXPECTED from --list | grep -c .; --list now yields 9 paths including dist/VERSION.

3 · Invariants

I-1 — One at-rest key file; nothing overwrites it once it holds bytes. B-3 states this in its
own docstring: "that file may hold the key under which live data was already encrypted, and
clobbering it makes that data undecryptable."

VIOLATED — backend/core/encryption.py:46-67 · BLOCKER · data loss

config.py honours the invariant. get_encryption_key() does not: file present but under 32
bytes → logger.warning("Invalid key … regenerating") → falls through and overwrites the file
with a fresh key. The original key bytes are destroyed on disk, so restoring them is no longer
possible even from a keys-volume snapshot taken after the boot.

Trigger: the key file is truncated or partially written — container killed mid-write, disk
full, a bad restore. Executed end to end:

file truncated to 30 bytes; .operator marker still present: True
config effective ENCRYPTION_KEY == truncated file : True
classified auto_generated                         : False
validate_production                               : PASSED (boots)
--- core.encryption.get_encryption_key() ---
returned key == original : False
file OVERWRITTEN         : True
original key recoverable : False
live data decryptable    : False -> InvalidToken

The production gate passes because the .operator marker is intact, so this happens on a
green production boot, silently. The marker still claims operator provenance afterwards, so
the next boot passes too.

Fix (~5 lines): in get_encryption_key(), when the file exists and is non-empty but
unusable, raise instead of regenerating. Fail closed — a crashloop is recoverable, an
overwritten key is not. The generate-and-persist path stays correct for a genuinely absent file.

I-2 — A container env var is delivered with a real value or omitted; never delivered empty.
Holds for DEFAULT_ADMIN_PASSWORD across all five compose files and the IBM installer (verified
above). MCP_SERVICE_PASSWORD still uses ${MCP_SERVICE_PASSWORD:-${MCP_PASSWORD:-}}, which
delivers "" — the form the invariant forbids. No reachable harm: the backend treats "" and
unset identically (if not self.MCP_SERVICE_PASSWORD), and the failure mode is a disabled MCP
integration, not a lockout. Noting the asymmetry, not filing it.

I-3 — One writer for the release version; everything else derives. Holds. --list yields 9
paths, both anti-vacuity floors derive from it, --check is the gate.

I-4 — One definition of the breaking-change marker; consumers embed, never redefine. Holds,
and is now count-asserted rather than enumeration-asserted, which closes the drift-in-the-token
hole that made the old parity test vacuous.

4 · Recommendation

MERGE once I-1 is fixed. Every round-4 finding is closed except B-3, and B-3's residue is one
function in one file with a five-line remedy. Nothing else in the round-5 diff has a trigger I can
name. The fixes this round were, unusually, aimed at the consumer rather than the changed line —
backup_service got the marker write, the auth test got the variant assertion, the backend and the
Helm guard were changed together so the * semantics match. That is the round-4 lesson actually
applied.

Notes for you — not findings, no action implied.

1. The 57-line dryrun-release-tooling job is apparatus verifying apparatus. It has never run in
   real CI. Keep or drop; either is defensible, and it is your call, not review debt.
2. Compose null-map resolution was verified on Docker Compose v5.3.1 only. podman-compose and
   docker-compose v1 are unverified. If either is a supported install path, that is worth knowing;
   if not, it is nothing.
3. core/encryption.py silently accepts any file ≥32 bytes without validating it as a Fernet key,
   so a hand-provisioned key file in the wrong format surfaces as a cipher error at import rather
   than as a clear message. Cosmetic next to I-1, same neighbourhood.

[mwiget]

Independent confirmation of round-5 I-1 — the blocker is real, reproduced end-to-end

I ran @bonnyr-f5's scenario against this PR's head 7c0b5564 (isolated KEYS_DIR, py3.11, the pinned cryptography==50.0.0 / pydantic-settings==2.7.1): operator provisions a valid Fernet key + .operator marker, live data is encrypted under it, then the key file is truncated to 30 bytes (partial write / disk full / bad restore). Boot sequence as in main.py — Settings() → validate_production() → import core.encryption:

file truncated to 30 bytes; marker present: True
config effective ENCRYPTION_KEY == truncated file : True
classified auto_generated                         : False
validate_production                               : PASSED (boots)
--- import core.encryption (runs get_encryption_key at import) ---
returned key == original : False
file OVERWRITTEN         : True
marker still present     : True
live data decryptable    : False -> InvalidToken
original key bytes anywhere on keys volume: False

Every line of the review's trace checks out. The chain:

1. Both config paths — _persist_or_load_key (config.py:125-131) and _seed_encryption_key_if_absent (config.py:184-198) — accept any non-empty file content with no length/Fernet validation. Marker intact → classified operator-provisioned → green production boot.
2. get_encryption_key() then rejects the <32-byte content (encryption.py:50) and falls through to Fernet.generate_key() + write (encryption.py:66-67). The .operator marker survives, so every subsequent boot also passes the gate on the app's own generated key. Silent.
3. Old ciphertext raises InvalidToken; new data is encrypted under the new key → mixed-key DB. For a file-provisioned key (the marker path this PR added) the key exists nowhere else, so a post-boot volume snapshot cannot recover it. Only an operator who provisioned via ENCRYPTION_KEY env and still holds it externally can restore — and the window narrows as new data accrues under the new key.

One nuance: the regenerate-on-invalid code is verbatim pre-existing on staging — this PR's diff to encryption.py is documentation only. I'd still hold it as a blocker here, because this PR's B-3 fix is what wrote down the invariant it violates ("nothing overwrites the file once it holds bytes"), made this file the single gated source of truth, and added the marker semantics that make the failure silently pass the production gate.

The proposed ~5-line fix is right: file exists and non-empty but unusable → raise (crashloop is recoverable, an overwritten key is not); keep generate-and-persist for a genuinely absent file. An empty file is safe to regenerate over — zero bytes destroyed, and config already does. Bonny's note 3 (≥32 bytes accepted without Fernet validation) is cosmetic as stated: a malformed ≥32-byte key crashes at Fernet(FERNET_KEY) (encryption.py:82), which fails closed by accident.

Repro script (runs standalone against the branch checkout)

import os
import sys
import tempfile

sys.path.insert(0, "<checkout>/backend")

keys_dir = tempfile.mkdtemp(prefix="i1-keys-")
os.environ["KEYS_DIR"] = keys_dir
os.environ.pop("ENCRYPTION_KEY_FILE", None)
os.environ.pop("ENCRYPTION_KEY", None)
os.environ["ENVIRONMENT"] = "production"
# satisfy unrelated production gates
os.environ["JWT_SECRET_KEY"] = "x" * 64
os.environ["MCP_SERVICE_PASSWORD"] = "a-real-secret-value-123"
os.environ["ALLOWED_ORIGINS"] = "https://example.com"
os.environ["DEFAULT_ADMIN_PASSWORD"] = "SomeStrongPass123!"

from cryptography.fernet import Fernet, InvalidToken

key_path = os.path.join(keys_dir, "encryption.key")
marker = key_path + ".operator"

# Boot 0: operator provisions a valid key; live data gets encrypted under it.
original = Fernet.generate_key()
with open(key_path, "wb") as f:
    f.write(original)
with open(marker, "w") as f:
    f.write("")
ciphertext = Fernet(original).encrypt(b"live secret encrypted before the incident")

# Incident: partial write / truncation leaves 30 bytes of the original key.
with open(key_path, "wb") as f:
    f.write(original[:30])

print(f"file truncated to {os.path.getsize(key_path)} bytes; marker present: {os.path.isfile(marker)}")

# Boot 1: config loads first (as in main.py) ...
from core.config import Settings

s = Settings()
with open(key_path, "rb") as f:
    file_now = f.read()
print("config effective ENCRYPTION_KEY == truncated file :", s.ENCRYPTION_KEY.encode() == file_now.strip())
print("classified auto_generated                         :", s._encryption_key_auto_generated)
try:
    s.validate_production()
    print("validate_production                               : PASSED (boots)")
except SystemExit:
    print("validate_production                               : SystemExit (refused)")

# ... then core.encryption imports at module load.
print("--- import core.encryption (runs get_encryption_key at import) ---")
import core.encryption as enc

with open(key_path, "rb") as f:
    after = f.read()
print("returned key == original :", enc.FERNET_KEY == original)
print("file OVERWRITTEN         :", after != original[:30])
print("marker still present     :", os.path.isfile(marker))
try:
    Fernet(enc.FERNET_KEY).decrypt(ciphertext)
    print("live data decryptable    : True")
except InvalidToken:
    print("live data decryptable    : False -> InvalidToken")
print("original key bytes anywhere on keys volume:", original in after or any(
    original in open(os.path.join(keys_dir, p), "rb").read() for p in os.listdir(keys_dir)
))

[mwiget]

Re-review of d30e258e — I-1 closed, verified by execution. APPROVE

Scope: the one commit since @bonnyr-f5's round-5 closure review, which was MERGE once I-1 is fixed. Round-5's closure table is unchanged by this diff (37 lines in backend/core/encryption.py, 42 lines of new unit tests — nothing else touched), so this pass is I-1 plus a regression sweep of the function it rewrites.

I-1 — closed

Same repro I used to confirm the blocker on 7c0b5564 (isolated KEYS_DIR, py3.11, pinned cryptography==50.0.0 / pydantic-settings==2.7.1), re-run against the new head:

file truncated to 30 bytes; marker present: True
config effective ENCRYPTION_KEY == truncated file : True
classified auto_generated                         : False
validate_production                               : PASSED (boots)
--- import core.encryption (runs get_encryption_key at import) ---
import                   : SystemExit -> FAILS CLOSED
   FATAL: the at-rest encryption key at .../encryption.key exists but is not a
   valid Fernet key (...). Refusing to regenerate over it -- ...
file PRESERVED (still the truncated original bytes): True
marker still present : True
--- recovery: operator restores the good key file ---
import after restore     : SUCCEEDED
returned key == original : True
live data decryptable    : True

The three properties the fix had to have all hold: the boot stops, the file on disk is not clobbered, and restoring a good key file recovers — the exact same process comes back up and decrypts data written before the incident. validate_production still passes on the truncated key (marker intact), which is fine: the defence is now at the layer that actually loads the key.

The SystemExit lands during a startup import — main.py:61 → routes.cloud_auth:14 → core.encryption:104 — so it is a real crashloop, not a lazy failure inside a request. Nothing in main.py or core/ catches it with a bare except:, and except Exception cannot.

Regression sweep — old vs. new, every key-file state

Loaded both revisions of the module side by side against a fresh key file per case:

key file state	OLD 7c0b5564	NEW d30e258e
truncated 30B	booted; file overwritten	SystemExit; file preserved
garbage 40B	ValueError at module import	SystemExit; file preserved, clear message
valid key	booted; untouched	booted; untouched
valid key + trailing newline	booted; untouched	booted; untouched
0-byte file	regenerates	regenerates
whitespace-only	regenerates	regenerates
absent	generates + persists	generates + persists

The truncated row is what makes the new test_truncated_key_fails_closed_and_is_not_overwritten non-vacuous — on the parent commit that path boots and overwrites, so the test reds there. The happy paths are byte-identical to before.

Round-5 note 3 is closed as a side effect (garbage 40B): a mis-shaped ≥32-byte key used to surface as ValueError: Fernet key must be 32 url-safe base64-encoded bytes from module-level Fernet(FERNET_KEY). It now surfaces as the named FATAL with recovery instructions.

The two paths that still regenerate — traced to production, not reasoned about

get_encryption_key() still falls through to generate-and-persist when the file is empty or unreadable (the new code routes both PermissionError and generic read errors to existing = b""). I chased both to their production behaviour rather than arguing from the code:

• 0-byte key file (the partial write that never got past open(…, 'wb')) — _persist_or_load_key sees empty content, so with a .operator marker it is M-1's provisioning error and without one it is a marker-less key: either way auto_generated=True, and SEC-006's fail-fast exits the boot with ENCRYPTION_KEY was not explicitly set before core.encryption is imported. Executed both arms; both refuse to boot.
• Unreadable key file (the keys-volume ownership case the function's own warning cites) — same classification, same refusal; import core.config exits 1. The file is not overwritten either, because the write is denied for the same reason the read was.

So in ENVIRONMENT=production there is no remaining path where a key file that ever held bytes gets regenerated over. In development both still regenerate silently, which is pre-existing and, with no production data at stake, not worth a gate.

CI

Green on d30e258e, rollup settled: 30/30, P3 Integration and both P4 jobs included. P1 · Unit Tests · Backend is where the three new tests run.

Nothing further from me. I-1 was the last open item and it is closed the way the review asked for: fail closed, because a crashloop is recoverable and an overwritten key is not.

[jgruberf5]

@bonnyr-f5 — I-1 fixed, d30e258e. Thanks for the closure-mode pass; that's the review this needed.

I-1 (BLOCKER) — core/encryption.py get_encryption_key() regenerated over existing bytes

You're exactly right, and it's the same invariant leaking into the one consumer config.py couldn't reach. The file's read path now honours "nothing overwrites it once it holds bytes":

• File absent (or 0-byte — no committed key to lose): generate + persist, as before.
• File present and non-empty: validate it as a real Fernet key. Valid → return it, untouched. Unusable (truncated/partial write, bad restore, wrong format) → SystemExit with a clear message, never regenerate. A crashloop is recoverable; an overwritten key is not.

That also closes your note #3 in the same spot: the old len >= 32 check accepted any ≥32-byte blob and surfaced a mis-shaped key as a cipher error at import; it now Fernet(existing)-validates and says so plainly.

Locked by test (TestAtRestKeyFileNeverRegeneratedOverBytes): a 30-byte truncated key → SystemExit and the original bytes survive on disk (recoverable); a valid key → returned and untouched; an absent file → generates a valid key. Reverting the fix reds the first two (old code returned a regenerated key and overwrote the file).

Verified on d30e258e: backend suite green; encryption unit tests 19 passed; helm/script-selftests/commit-lint unchanged and green; ruff clean.

Your three notes

1. dryrun-release-tooling — keeping it. It's 57 lines that only run during a release, and it exists precisely because B-2 (a release step wired ahead of a signature that could never execute) cost a full round. Cheap insurance against that exact class; I'd rather it be apparatus-verifying-apparatus than discover the next one post-signature. Your call flagged, decision recorded.
2. Compose engine — the null-map passthrough was verified on Docker Compose v5.3.1 only. It's the standard compose-spec behaviour (a null mapping value = pass-through-or-omit), but podman-compose / docker-compose v1 are unverified. If either is a supported install path, say so and I'll verify; otherwise noted and left.
3. Folded into the I-1 fix above.

Every round-4 finding is closed and the one round-5 blocker is fixed with its regression test. Re-requesting for the merge sign-off.

[bonnyr-f5]

Round 6 review — d30e258e · Closure Review · MERGE

One commit, two files, +72/−7, and zero machinery added. That is what a terminating round
looks like, so this review is correspondingly short: I-1 was the only thing open, I-1 is closed, and
nothing else in the diff has anything for me to check.

---

1 · Apparatus trace

	machinery	product	ratio
r4 5886be3c	3347	2456	1.36:1
r5 7c0b5564	3895	2929	1.33:1
r6 d30e258e	3895	2959	1.32:1

Machinery is flat — no script, gate, job, flag or harness was added to fix I-1. The fix is 30
lines in the file that had the bug and 42 lines of test. Nothing here traces to a finding about
review apparatus, so there is nothing for the next round to review. That is the whole point.

2 · Closure table

#	Verdict	Evidence
I-1 at-rest key regenerated over existing bytes (data loss)	CLOSED	Five cases, each in an isolated process against the real module (table below).
B-3 (was PARTIAL on I-1)	CLOSED	I-1 was its only residue.
r5 Note 3 — any file ≥32 bytes accepted without Fernet validation	CLOSED	Fixed in the same change; a mis-shaped 44-byte file now fails closed instead of surfacing later as a cipher error.
All other r4 findings	CLOSED at r5, untouched here	Delta is 2 files.

case                 outcome                        key file
1 truncated (30B)    SystemExit                     preserved   <- the I-1 trigger
2 mis-shaped 44B     SystemExit                     preserved   <- r5 Note 3
3 valid key          returned, decrypts live data    untouched
4 absent file        generated + persisted           created
5 empty file (0B)    generated + persisted           created

Two details worth recording because they are the difference between a fix and a real fix:

• The failure lands at import, not at call. SystemExit propagates out of the module-level
  cipher init, so the container refuses to start with the operator message rather than running and
  failing per-request. SystemExit derives from BaseException, so the one except BaseException
  in the tree (services/reachability/breaker.py:228,258) cannot swallow it — it is not on an
  import path.
• The test asserts the harm, not the mechanism. test_truncated_key_fails_closed_and_is_not_overwritten
  checks f.read() == truncated — the file still holds the original bytes — not merely that
  something raised. Mutation-checked: neutering the validation to always pass produces exactly
  1 failed, 18 passed, and that one failure is this test. It is not vacuous.

Regression check: the full backend unit suite is 4857 passed at this head, so an import-time
SystemExit on a bad key file breaks no existing consumer.

The error message also does the operationally right thing: it tells the operator to restore from a
keys-volume backup and states the one condition under which deleting the file is safe (no encrypted
data yet). That is the difference between a crashloop someone can recover from and one they guess at.

3 · Invariants

I-1 — One at-rest key file; nothing overwrites it once it holds bytes. Now enforced in both
modules, not just stated in one. config.py never overwrites; core/encryption.py fails closed
rather than regenerating. The two modules that B-3 unified now agree.

I-2 / I-3 / I-4 — unchanged and untouched by this delta (container env contract, release-version
single-sourcing, breaking-change marker single-definition). Still holding as recorded at r5.

4 · Recommendation

MERGE. Every blocker, major and minor from rounds 2–5 is closed, and the last one closed without
adding surface. #192 closes on merge.

For the record, since it is the reason this sequence ended: the two rounds that converged are the two
where the fix went to the consumer rather than the changed line — r5 put the .operator marker in
backup_service, the variant assertion in the auth test, and the * semantics in both the backend
and the Helm guard; r6 put the enforcement in the module that actually held the destructive write.
Rounds 2–4 fixed the line and grew a gate.

Nothing carried forward as review debt. The two r5 Notes that remain are yours to close or drop,
and neither blocks: the 57-line dryrun-release-tooling job is apparatus verifying apparatus, and
compose null-map resolution is verified on Docker Compose v5.3.1 only.

On merge, I-1..I-4 go into the invariant registry so the next feature's first-pass review sweeps for
them cheaply. The invariants are the durable output of these six rounds. The apparatus is not.