docs(release): reset release notes after v0.4.0

docs/releases/UNRELEASED.md

@@ -1,69 +1,15 @@
-# PickCheck 0.4.0
+# PickCheck <version>
 
-This release changes what PickCheck fails on and lets it judge a branch
-instead of the whole file. Cognitive complexity replaces cyclomatic
-complexity as the default gate, so readable flat dispatch stops failing and
-deeply nested conditions start. `check --base` checks everything a branch
-changed since it forked, and compares each violation with the merge base, so a
-one-line edit in a legacy function no longer fails on debt that was already
-there when `--fail-on` excludes it.
+<One paragraph on what this release is for.>
 
 ## Changes
 
-- New `cognitive` metric, default limit 15, replaces cyclomatic `complexity`
-  as the default gate. It scores how hard control flow is to follow: a
-  `switch` or `match` costs 1 however many arms it has, and every branch or
-  loop costs more the deeper it is nested. The algorithm is pinned per
-  language in `docs/spec.md`. (#7)
-- `complexity` is still measured but its default limit is now `null`, which
-  turns the check off. Add `"limits": {"complexity": 15}` to `.pickcheck.json`
-  to restore the old gate. Any limit, global or per language, now accepts
-  `null`. (#7)
-- This changes what fails on upgrade. Across 32,805 functions in 19
-  repositories, the old gate failed 118 and the new one fails 220: 27 stop
-  failing, mostly long flat `switch`es, and 129 start, because they nest
-  conditions the old count could not see. (#7)
-- Dart `on T { }` handlers without a `catch` now count toward `complexity`.
-  (#24)
-- `&&` inside Rust let chains (`if let … && let …`) now counts toward
-  `complexity` and `bool_ops`. (#26)
-- `check --base <ref>` checks the functions a branch changed since it forked
-  from `<ref>`, committed or not, plus untracked files. It implies
-  `--changed`, and a stacked branch checked against its parent reports only
-  its own functions. (#29)
-- The `.pickcheck.json changed in this diff` note now also appears when the
-  config is deleted or renamed, not only when it is edited. (#32)
-- Dart mixin members are now reported as `Mixin.member`, like class and
-  extension members, so their names in reports change. (#30)
-- `check --base` compares each violation with the same function at the merge
-  base and reports a status: `new`, `worsened`, `unmatched`, `improved`, or
-  `unchanged`. `--fail-on` picks which statuses fail; the others print as
-  `WARN` and never fail the run. Without `--fail-on` every violation still
-  fails, and hooks and plain `--changed` are unchanged. JSON gains `base`,
-  `fail_on`, and per-violation `status`, `base_metrics`, and `limits`. (#30)
+- <One line per user-visible change, with its issue or PR number.>
 
 ## Validation
 
-- `cargo test --workspace --locked --all-targets`, `cargo clippy --workspace
-  --all-targets -- -D warnings`, `cargo run -- check crates`, and
-  `cargo llvm-cov --workspace --locked --fail-under-lines 94` (94.23% lines)
-  pass on `main` at fed4279: https://github.com/pickforge/pickcheck/actions/runs/36576086532
-- Golden fixtures cover every language, including hand-derived cognitive
-  values and the Dart mixin names.
-- The cognitive rollout numbers above come from scanning 32,805 functions in
-  19 repositories (#6).
-- `--base` and the baseline comparison are covered by CLI tests over real Git
-  repositories: committed, staged, unstaged and untracked changes, stacked
-  branches, renamed files, duplicate names, closure pairing, unreadable bases,
-  and `--fail-on` exit codes.
+- <What was actually run, and where its evidence lives. Nothing aspirational.>
 
 ## Known limits
 
-- The baseline comparison matches functions by name within a file. A renamed
-  function, or one moved into a different file, counts as `new`; a file
-  rename that Git detects keeps its functions paired.
-- Anonymous closures pair by position under their named owner. Adding or
-  removing a closure there makes its siblings `unmatched`.
-- With several merge bases in a criss-cross history, Git's choice is used.
-- Paths that are not valid UTF-8 are decoded lossily.
-- Hooks still check against `HEAD` and never compare with a base.
+- <What this release does not do, and what is not proven yet.>