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5a6e25bbaf
Address Copilot review (2026-05-11, review id 4266902103):
1. `record_existing` was calling `(self.project_root / rel).is_symlink()`
BEFORE validating containment. For absolute paths or paths containing
`..`, this performed a filesystem stat outside the project root before
`_validate_rel_path()` raised. Add a cheap lexical pre-check that
delegates to `_validate_rel_path()` for the canonical error messages,
so the symlink stat only ever runs on paths that are already lexically
inside the project root.
2. Add focused unit tests in `tests/integrations/test_manifest.py` for
the symlink and non-regular-file error paths, including:
- symlink target rejection
- dangling symlink rejection (caught by the symlink guard before
the is_file check)
- directory path rejection (is_file == False)
- missing-path rejection (is_file == False)
- absolute-path lexical pre-check
The Copilot reviewer noted these guards had no focused coverage in
`test_manifest.py`, only via the `test_integration_claude.py`
regression test.
3. The third Copilot finding (repeated `dict(self._files)` copies via
`manifest.files` in the skip branches) is already resolved on this
branch by using `prior_hashes` — the function-scope snapshot taken at
the top of `install_shared_infra` — for the membership check, instead
of `manifest.files`.
AI disclosure: drafted with assistance from Claude (Opus 4.7).