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tiennm99
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A finished room now stays alive to ask both players whether they want another, and restarts with a fresh opening word once both do. Only a room with two connected humans offers one: a bot has nothing to negotiate, so a bot room closes the moment its game ends rather than leaking a goroutine and an engine per finished game. turn_seq no longer restarts at one. A rematch reuses the same connections, so a submission still in flight from the previous game could otherwise match a turn in the new one and be applied to it. The end-of-game decision sits after the whole select, so every way a game can end reaches it. Opening the offer from the message arm alone meant the turn clock — the most common natural ending — closed the room with nothing to accept. A resume is refused into a finished game, including one waiting on a rematch answer, so the room now retires the connection being replaced only once it has agreed to the swap. Retiring it up front ended the game the client was trying to rejoin, which a duplicated tab was enough to trigger. attach releases the room it is leaving. Nothing else told that room the connection had gone, so a session asking for several rooms stranded all but the last, each parked in select holding a goroutine and a room code for the life of the process. Also: RequestRematch is rate limited, because it is the only client message that fans out to both players and an unbounded one lets a burst fill the opponent's outbox until their session is closed for falling behind. And a resume announces itself to the opponent, who was otherwise left watching a disconnect banner for someone already playing again.