hygiene(bash-retirement): check stale category metadata

[AceHack]

Summary

• Validate that the retained-shell category map has no stale entries outside EXPECTED_RETAINED_SHELL.
• Surface stale category metadata in the bash-retirement inventory report.
• Add focused coverage for stale category detection and report rendering.

Checks

• PASS: bun test tools/hygiene/check-bash-retirement-inventory.test.ts
• PASS: bun tools/hygiene/check-bash-retirement-inventory.ts --enforce
• PASS: git diff --check and git diff --cached --check
• BLOCKED locally: bun run typecheck (tsc is not installed in this worktree environment)
• BLOCKED locally: bunx eslint tools/hygiene/check-bash-retirement-inventory.ts tools/hygiene/check-bash-retirement-inventory.test.ts (ESLint 10 requires jiti for TypeScript config loading)

[Copilot]

Pull request overview

Adds an integrity check to the bash-retirement inventory guard to detect stale entries in the retained-shell category map (category metadata that references files no longer in EXPECTED_RETAINED_SHELL), and surfaces these errors in both the rendered report and tests.

Changes:

• Extend allowlist integrity inspection to flag stale category-map entries.
• Render stale category-map drift in the human-readable inventory report (including a new summary counter).
• Add targeted tests covering stale category detection and report rendering.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
tools/hygiene/check-bash-retirement-inventory.ts	Adds stale category-map detection to allowlist integrity checks and report output.
tools/hygiene/check-bash-retirement-inventory.test.ts	Adds coverage for stale category detection and report rendering.
docs/claims/codex-loop-bash-retirement-category-map-integrity-20260527.md	Introduces a claim file documenting the work scope (should be released/removed when landing).

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.