chore(hooks): scope readme_guard to repo tree only

[zackees]

Summary

ci/hooks/readme_guard.py was blocking Write operations anywhere on disk, including outside the fbuild repo. That came up while writing to Claude's user-level memory directory (~/.claude/projects/.../memory/) — the hook demanded a README.md in a directory the repo doesn't own.

Change

Early-return when the written file resolves outside the repo root (the hook runs with cwd = git rev-parse --show-toplevel, so Path.cwd().resolve() is the repo root at invocation time).

Verified:

File location	README present?	Exit
Outside repo	—	0 (skip)
Inside repo, dir has no README	no	2 (block)
Inside repo, dir has README	yes	0 (pass)

Test plan

• Manual: three stdin probes above.
• CI.

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 5e044198-164b-4e3d-9815-5fb58f34d3ba

📥 Commits

Reviewing files that changed from the base of the PR and between f8533d3 and f0de65f.

📒 Files selected for processing (1)

• ci/hooks/readme_guard.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/readme-guard-repo-scoped

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