sneak 90b2f6fa66 test: add failing test for evictSourceBlob unlink-vs-store TOCTOU ...

Adds an instrumentation seam (evictSourceBlobTestHook, fired after the
row-deletion transaction commits and before the content file is
unlinked) and a test that pauses eviction there while a concurrent
StoreSource for identical content bytes races it. Currently red: the
store completes immediately instead of being excluded, which is
exactly the window the review flagged between evictSourceBlob's commit
and its unlink.

2026-08-09 00:45:39 +00:00

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