Rooms drifted in speed and kept pausing on poor links. A 2x long-press or a
speed pick on any peer propagated with no attribution, so it read as the app
changing speed on its own; a host whose cache starved let mpv resume its player
on its own timetable while the room waited, so every recovery re-anchored ahead
of the guests and they hard-seeked in a loop; and a wall-clock step on a guest
made every host anchor read stale and seeked the file by the size of the step.
Rate intent is now declared by the screen (speed sheet, keyboard, long-press,
media controls) through WatchTogetherProvider.onLocalRate instead of being
inferred from the player's rate stream, matching how seeks already work. The
expectation ledger no longer tracks rate at all, so a nudge, a default-speed
apply or a late ack can never become a room rate change, and a promoted host
adopts the room rate rather than its player's momentary one. Remote rate
changes surface as "<name> set the speed to <rate>".
The host pauses its own player when it stalls, anchors the room there, raises
mpv's cache-pause-wait to 4s, and holds the resume until it has buffered three
times the stall it just had. Heartbeats during a sub-grace blip keep
extrapolating the previous anchor instead of re-anchoring on a frozen position.
The sync layer's clock is monotonic. ClockSync discards its window when a
sample's offset moves further than the round trips involved can explain, and a
guest that receives an anchor reading implausibly old holds corrections and
re-converges instead of seeking.
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