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* feat(ci): automate ratchet shrink-banking on the release branch (#8584)
The quality ratchet is only half automatic, and it is the wrong half. Raising a
cap is a manual JSON edit that takes ten seconds and is the fastest way to unblock
a red PR. Lowering one requires someone to run `--update` and commit the result —
and no workflow does: grepping `.github/workflows/` for `--update` finds only
wiki-sync.yml (unrelated) and ci.yml's check-quality-ratchet.mjs --require-tighten
(a different script against a different metric).
Measured on release/v3.8.49 at 4053e2314: 18 frozen files already at or under the
800-line new-file cap, the worst at 132x (src/shared/validation/schemas.ts, 19
lines carrying a 2,523 cap); the complexity ceiling walked 1794 -> 2169 across ~37
rebaseline notes with exactly one decrease (-1); "tighten via --update next cycle"
written 31 times and honoured once in six weeks. A cap that outlives the code that
earned it converts every completed decomposition into a growth allowance for
whoever edits that file next.
New job `bank-ratchet-shrinks` in nightly-release-green.yml measures the active
release branch, runs the two shrink-only `--update` paths, and opens ONE
always-current PR with the result. Schedule/dispatch only, deliberately not on
push: banking has no latency requirement, while a per-merge run would rebuild the
PR branch during merge campaigns and pay for a full ESLint walk each time.
Detection stays on push (release-green); only banking is batched. The job never
pushes to release/* — a human merges, so a bad measurement cannot land unreviewed.
scripts/quality/verify-ratchet-bank.mjs is the hard guarantee that the automation
can only ever write downward. It diffs the post-`--update` tree against HEAD and
aborts the job before a commit exists — opening no PR — unless every change is a
frozen/testFrozen entry lowered or removed, `count` lowered, or
cognitiveComplexity.value lowered. Raising a number, adding an entry, changing
cap/testCap, or deleting/rewriting a `_rebaseline_*` note all fail. A bot that
could raise a cap would be strictly worse than the status quo.
Verified both directions against the real baselines: --update + verifier reports
77 lowered / 14 removed / nothing raised, exit 0; hand-raising chatCore.ts to 9999
and cap to 1200 is rejected with exit 1. 22 unit tests cover each way the
automation could go wrong.
No product code changes.
* chore(skills): sync cli-backup-sync SKILL.md after rebase onto tip