hailin 576679ae30 fix(server-party): heartbeat during waitForAllParticipants ... Problem: - co_managed_keygen server-party waits for external party after joining - No heartbeat sent during wait period (up to 5 minutes) - session-coordinator has 120 second inactivity timeout - Server-party marked as timed_out/failed while waiting Fix: - Send heartbeat in waitForAllParticipants polling loop - Add Heartbeat method to MessageRouterClient interface - Heartbeat every 2 seconds with poll interval - Heartbeat failure only logs warning, does not block Generated with Claude Code Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>		2025-12-29 13:04:40 -08:00
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use_cases	fix(server-party): heartbeat during waitForAllParticipants	2025-12-29 13:04:40 -08:00