[hooks] stop block-read-outside-cwd false-deny on globs and mounts

[NiveditJain]

Summary

• extractAbsolutePaths (src/hooks/builtin-policies.ts) used a negative lookbehind that only excluded identifier-ish chars, so a / after a glob meta or a compound-token separator was treated as the start of a fresh absolute path. Two common shapes were misread:
  • grep -rn 'Tab title=' docs/*/dashboard.mdx | head -30 → extracted /dashboard.mdx, then resolved outside cwd → deny.
  • docker run -v /home/user/project/docs:/docs node:20 ls /docs → extracted /docs (the container path) → deny.
• Add *?:= to the lookbehind exclusion class so a / that immediately follows a glob meta or a separator does not start a match. Quoted paths, whitespace-separated absolute paths, and the ~/.claude/ whitelist all keep their existing behaviour.
• 5 new regression tests in __tests__/hooks/block-read-outside-cwd.test.ts cover unquoted * and ? globs, the volume-mount shape, env-var-prefixed paths, and a still-denies case where a real outside read sits next to a glob. All 1083 unit tests pass; lint is clean.

Test plan

• bun run test:run __tests__/hooks/block-read-outside-cwd.test.ts — 54 passed
• bun run test:run — 1083 passed
• bun run lint — clean (only an unrelated <img> warning)
• Reproduce the original false-deny by running grep -rn 'Tab title=' docs/*/dashboard.mdx | head -30 in a session with this policy enabled — expect allow

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 43344a82-5823-4e4f-a71f-19b6176d03ef

📥 Commits

Reviewing files that changed from the base of the PR and between 11147a8 and cffba9c.

📒 Files selected for processing (3)

• CHANGELOG.md
• __tests__/hooks/block-read-outside-cwd.test.ts
• src/hooks/builtin-policies.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch luv-hooks-extract-paths-fix

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