Add new ExecuteWithSessionInfo method to ParticipateKeygenUseCase
for server-party-co-managed to skip duplicate JoinSession call.
- server-party-co-managed already calls JoinSession in session_created phase
- ExecuteWithSessionInfo accepts pre-obtained SessionInfo and skips internal JoinSession
- Refactor common execution logic to private executeWithSessionInfo method
- Update server-party-co-managed to use ExecuteWithSessionInfo on session_started
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>