Rewrites getPhaseReviewDiff to return file-level metadata (path, status,
additions, deletions) instead of a raw diff string, eliminating 10MB+
payloads for large repos. Adds getFileDiff for on-demand per-file hunk
content with binary detection via numstat. Multi-project initiatives
prefix file paths with the project name to avoid collisions.
Adds integration tests that use real local git repos + in-memory SQLite
to verify both procedures end-to-end (binary files, deleted files,
spaces in paths, error cases).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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