🧪 [testing improvement] Add tests for repair_projections

[undivisible]

🎯 What: Added tests for the MemoryDb::repair_projections function to address the testing gap.
📊 Coverage: Covered 4 scenarios: empty outbox, stale embeddings on target modification, embeddings cleanup on target deletion (NotFound), and handling of invalid target kinds.
✨ Result: Improved test coverage for database corruption and projection repair mechanisms.

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PR created automatically by Jules for task 14172526879755234929 started by @undivisible

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Note

Low Risk
Test-only changes with no production code modifications.

Overview
Adds unit tests for MemoryDb::repair_projections in a new repair test module.

Covers four cases: empty outbox, deleting stale embeddings after target modification, cleaning up embeddings and FTS when the target is gone, and marking invalid outbox entries as processed.

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[google-labs-jules]

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(requestId: serverGenReqId_ef01756a-6f0c-4db4-8983-a0598506834e)

[undivisible]

Superseded by the reviewed and merged integration in #22.

[google-labs-jules]

Superseded by the reviewed and merged integration in #22.

Understood. Acknowledging that this work is now obsolete and stopping work on this task.