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4grayandClaude Opus 5
4db3a2fdea
Addresses three defects Greptile found in the multi-source review. **Concurrent switches committed out of order.** Selecting a second source before the first resolution returned let the slower request overwrite the newer selection and repoint Undo at itself. `switchTo` now takes a sequence number and drops its result if a newer switch already committed. **Stale switches crossed movie sessions.** Navigating to another film while a resolution was in flight let the continuation activate the old film's source inside the new controller — and restart it from that session's zero resume position. The controller is now snapshotted per operation and the movie session is revalidated after every await. `check()` had the same hazard across its two awaits and is guarded the same way. **Short titles skipped discovery entirely.** The trigram tokenizer cannot index tokens under three characters, so "Up", "It" or "Us" produced an empty MATCH expression and the query was discarded before SQLite was consulted — the chip could never appear for those films. Discovery now falls back to a bounded scan when FTS structurally cannot serve the title; the existing two-tier normalized confirmation still rejects loose hits like "Upgrade". Each fix carries a regression test; all three were mutation-checked by removing the guard and confirming exactly those tests fail. The previous test asserting that short titles return nothing encoded the bug and has been replaced. The host spec passed 400 lines, so its fixtures moved to a shared module and the race suite into its own file. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>