- Query keygen session from mpc_sessions table to get correct threshold_n
- Pass keygenThresholdN to CreateSigningSessionAuto instead of len(parties)
- Return parties list and correct threshold values in GetSignSessionByInviteCode
- This fixes TSS signing failure "U doesn't equal T" caused by mismatched n values
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>