- split.ProvenanceTracker: Check _unified_manager.track_chunk() return value and fall back to legacy storage when None is returned (storage failure)
- split.ProvenanceTracker: Initialize legacy stores (_provenance_store and _chunk_registry) unconditionally in __init__ so legacy fallback storage works safely even when initialized with use_unified=True
- split.ProvenanceTracker: Update get_provenance() to check legacy storage when no record is found in unified storage, ensuring fallback-tracked chunks remain retrievable
- SourceTracker: Change track_sources_batch() condition from if entry is not None: to if ok: to respect the boolean return contract (-> bool) of track_entity_source(), track_property_source(), and track_relationship_source()
- Tests: Add regression test test_unified_tracking_returns_none_triggers_fallback and update test_track_sources_batch_failure_not_counted to test boolean failure return_value=False
Sameer6305
4dea295f0d