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Rebasing onto #612 exposed a silent gap rather than a conflict. #612 added a `projectionFailureCount` parameter to MediaServerReconciliationGuard.ShouldFlagMissing that refuses the sweep when the enumeration reported swallowed projection exceptions — but the parameter is OPTIONAL with a default of 0, so this scanner compiled unchanged while opting out of the protection entirely. ProjectToMusicVideo has exactly the swallowing catch #484 exists to defend against, so the music-video sweep would have been the only one unguarded. - MediaServerMusicVideoLibraryScanner creates one MediaServerProjectionFailureCounter per enumeration (never a field on the singleton api client, so concurrent scans of different libraries can't leak failures into each other's sweep decision), passes it to GetMusicVideoLibraryItems, and feeds its Count to ShouldFlagMissing. - The single guard call also gates the #496 legacy path diff, which is more exposed: a legacy row has no etag to fall back on. - ProjectToMusicVideo now returns MediaServerProjectionResult<JellyfinMusicVideo>, combining #612's Skipped/Failed distinction with #496's identity type. - main's own #484 music-video test targeted the pre-#496 hard-delete scanner (FindMusicVideoPaths /DeleteByPath) and no longer applies; it is replaced by two tests in the new architecture covering the identity sweep and the legacy sweep. Both proven non-vacuous — removing projectionFailures.Count from the guard call fails exactly those two. 4,277 tests green; format/BOM clean; decisions validator OK.