Address Copilot review comment id 4309888722 round-5 (2026-05-21) on PR #2483:
``is_recovered()`` previously checked ``self._recovered_files`` membership
with bare ``Path(rel).as_posix()``, while ``record_existing()`` stores keys
via ``_validate_rel_path(rel, root).relative_to(root).as_posix()``. The two
normalizations disagreed on absolute paths and paths that escape the
project root — ``is_recovered`` would silently return False for inputs that
``record_existing`` would have refused entirely.
The fix routes ``is_recovered`` through the same ``_validate_rel_path``
pipeline; ``ValueError`` from the validator is caught and converted to
False so query semantics stay exception-free (Python ``__contains__``
convention).
Tests: 2 new methods in ``TestManifestRecoveredFiles``:
- ``test_is_recovered_absolute_path_returns_false``
- ``test_is_recovered_escaping_path_returns_false``
🤖 AI disclosure: drafted with assistance from Claude (Opus 4.7).
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