ca5a1e926d
RealParticipant gains _sessionFinished TCS + MarkSessionFinished / AwaitSessionFinishedAsync. PvP first-arriver's handler awaits the signal instead of calling self.RunAsync (which the session does internally on the same instance — double-call would race the WS read). BattleSession.RunAsync branches on Type: Pvp uses WhenAny + synthesize BattleFinish(Win) to survivor + WhenAll(drain); Scripted/Bot keep Phase 1's WhenAll-everything semantics. Disconnect cascade now drives end-of-battle when a WS drops without a graceful Retire.