CLAUDE.md advertises a craftsmanship-checker size gate (300 lines/file, 40 lines/method) that does not exist

[cdeust]

Finding (measured, not assumed)

CLAUDE.md "Code Style" states:

300 lines max per file; 40 lines max per method. Enforced by the
craftsmanship-checker pre-commit hook.

That hook does not exist. Verified 2026-07-30:

• No file matching *craftsmanship* anywhere in the tracked tree.
• No non-sample hook in .git/hooks/ (only .sample templates).
• No .pre-commit-config.yaml.
• No CI job in .github/workflows/ci.yml checking file or method length
  (the lint job runs ruff format/ruff check, doc-claims, badges,
  uv.lock/pip-constraints sync, and actionlint — none measure length).
• scripts/install_hooks.py exists but is unrelated: it migrates legacy
  Claude Code session hooks out of ~/.claude/settings.json, not a git
  pre-commit hook.

The caps have been documented and unenforced. PR #284 shipped a 54-line
method (run_stdio_drained, over both the general §4.2 50-line cap and
this repo's own stricter 40-line convention) through 19 passing checks
before a manual review caught it (see docs/provenance/ / PR #284 history)
— nothing automated would have.

Acceptance criteria

• A real, blocking CI gate (wired into the lint job) measures file length
  and per-function/method length (signature-to-close, AST lineno..
  end_lineno) against the 300/40 caps, with sanctioned exemptions only
  (auto-generated file marker; pure match-statement dispatch functions).
• Negative-control tests prove the gate rejects a deliberately over-cap
  file and function.
• The gate is run against the full current tree and reports every existing
  breach; a large pre-existing backlog is handled via a committed, dated
  ratchet baseline that can shrink but never grow (tracked separately, see
  follow-up issue for the backlog itself).
• An optional local pre-commit hook is also provided.

[cdeust]

Already fixed on main by #276. Verified at CLAUDE.md:74-79 — the claim now reads:

"300 lines max per file; 40 lines max per method — a local tightening of
coding-standards.md §4.1/§4.2 (<=500/<=50). Enforced by code review today; no
automated pre-commit hook checks this yet (issue #276 corrected the prior
claim of a 'craftsmanship-checker' hook — none exists in .git/hooks/ or a
.pre-commit-config.yaml)."

The documentation no longer advertises enforcement that does not happen, which was this issue's subject. The 836 pre-existing breaches behind the old claim are closed as #298 rather than carried as a backlog.