- Modify ValidateSessionCreation to differentiate between keygen and sign sessions
- For keygen: require participantCount == threshold.N() (all parties must participate)
- For sign: require participantCount == threshold.T() (only t parties needed)
- This fixes "session is full" error when creating signing session with 3 parties but n=5
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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