* fix: defer eager observation-index build to first model call
* fix: add mtime-keyed cache to list_observation_documents to avoid re-parsing unchanged files
* fix: return a copy of the cached document list and strengthen the deletion test
* fix: copy cached document list on read and write to prevent caller mutations
* fix: split global and project cache to avoid duplicate parsing and cross-project invalidation
* fix: bump mtime explicitly in cache modification test for Windows NTFS resolution
* fix: bound project observation cache with LRU eviction
* fix: deduplicate path logic and strengthen cache typing
* fix: group cache tests under TestObservationCache with autouse fixture and fix f-string interpolation
* fix: reject non-positive observation cache cap in config validation
* fix: cache resolved observation docs and config cap to avoid repeated work
* fix: use st_mtime_ns and st_size in cache signature for NTFS reliability
* test: clear EVOSCIENTIST_MAX_CACHED_PROJECTS in test env cleanup fixtures
* test: cover per-file observation cache semantics
* fix: replace layered observation caches with per-file parse cache
* fix: serialize observation parse cache transactions
jfilipiuk
3d6cc959e3