- Refactored filesystem scan cache integration to use pre-scanned entries from fs_cache module instead of manual directory walking in grep.rs.
- Extracted filesystem scan cache invalidation helpers into dedicated fs-cache-invalidation.ts module with three functions: invalidateFsScanAfterWrite, invalidateFsScanAfterDelete, and invalidateFsScanAfterRename.
- Centralized file mention discovery profile configuration into getMentionCandidateDiscoveryProfile() function for improved maintainability.
- Added comprehensive documentation of filesystem-scan cache architecture contract including cache key specifications, TTL policies, and invalidation patterns.
- Updated CHANGELOG.md to document filesystem scan cache invalidation helpers and named discovery profile for file mention candidates.
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