docs(unic-archon-dlc): reconcile Archon version + node schema (redesign step 00)

[orioltf]

Why

Pre-work step 00 of the unic-archon-dlc workflow redesign (docs/redesign/PLAN.md). This step gates every other step — the redesign assumed it could refactor the 7 shipped workflows in place, but that assumption rested on a version and a schema that turned out to be wrong. We must lock the truth before touching workflow YAML.

What was found (empirically)

• Installed Archon is v0.3.12. The brew tap formula caps there (brew … coleam00/archon/archon → 0.3.12 already installed); the "update → v0.4.1" notice is GitHub-Releases-only, not brew-installable. The AGENTS.md claim "Archon ≥ 0.10" was fictional — no such version line exists.
• The shipped workflows use a schema the CLI does not honour. Archon is key-discriminated (each node has exactly one of command|prompt|bash|script|loop|approval|cancel); the shipped YAMLs use a type: discriminator + node-level fresh_context: + inputs:/{{ }} Jinja.
• archon validate passes all 7 anyway — because the stray type: field is silently ignored and every node still carries a recognised content key. Validation success masks silent semantic failures:

Shipped (type:-style)	Runs on v0.3.12 as	Defect
type: interactive + fresh_context + prompt:	plain prompt	🔴 HITL gate never pauses
type: loop + prompt: (no loop:/until:)	single-shot prompt	🔴 loop never iterates
node-level fresh_context: true	ignored	🔴 anti-cheat isolation never applied
inputs: + {{ inputs.slug }}	literal passthrough	🔴 slug never substituted; paths break

This is a blocking migration, not a cosmetic mismatch — gates, loops, fresh-context, and slug substitution are all inert while the CLI reports success.

Changes (research + writing only — no workflow YAML touched)

• Add ADR-0011 — version target (≥ 0.3.12, 0.4.1 forward-compatible-but-unverified) + key-discriminated node-schema conventions all redesign steps must follow.
• PLAN.md pre-work Fix release workflow, document Gitflow, and close post-launch open points #1 rewritten — confirmed version, translation table, silent-failure finding, ⚠ blocking-migration flag, $ARGUMENTS-slug implication.
• AGENTS.md (+CLAUDE.md symlink) — ≥ 0.10 → ≥ 0.3.12 + ADR-0011 link.
• ADR-0003 Accepted → Superseded by ADR-0009 (Ralph-era spec format retired by 0009 but never reflagged) + ADR index updated + 0011 row added.

"Done when" — answered

Need	Schema convention
HITL gate	approval: node + workflow-level interactive: true
Loop	loop: key (prompt/until/max_iterations)
Fresh-context node	context: fresh (or loop.fresh_context)
Data passing	$nodeId.output(.field); input via $ARGUMENTS; $ARTIFACTS_DIR; no inputs:/{{ }}

Verification

• All 7 shipped workflows still archon validate → ok (no YAML touched).
• Prettier clean on all edited Markdown. No lib/ changes → no typecheck/test.

🤖 Generated with Claude Code