hailin cfbda7bbc7 fix(co-sign): validate exactly t parties for t-of-n signing ... For threshold signing, exactly t parties are required: - 3-of-5 → 3 parties - 2-of-3 → 2 parties - 4-of-7 → 4 parties 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>		2025-12-31 01:21:12 -08:00
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http	fix(co-sign): validate exactly t parties for t-of-n signing	2025-12-31 01:21:12 -08:00