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Review follow-up for the relative seek path. The macOS and Windows/Linux `seekBy` exports advanced `snapshot.positionSeconds` by the delta after dispatching the mpv command. That is not idempotent the way the absolute seek's optimistic write is: the observer (mpv event thread, or the Linux IPC poll) can already have stored the post-seek `time-pos` under the same mutex, so adding the delta on top counted the step twice, and while paused nothing corrected it. On Linux it also advertised a position that a failed socket delivery never reached. Relative steps now leave the snapshot alone; only the observed `time-pos` updates the position. The packaged Linux frame-copy smoke now drives `seekEmbeddedMpvBy` through the built app: a burst of three +2 s steps issued without waiting for snapshots has to land on 6 s, and a -60 s step has to clamp at 0. The generated Y4M fixture grows from 2 s to 12 s (about 415 KB) so the burst and the playing section that follows stay inside the clip. Replayed against a local mpv 0.39 with the same fixture and media server: burst -> 6.0, -60 -> 0. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>