- Add TypeRig IssueType constant for rig identity beads - Add TypeRig to IsValid() switch statement - Add IsBuiltIn() method for multi-repo hydration trust checks - Add Crystallizes field to Issue struct and ComputeContentHash Fixes validation rejecting documented issue types like 'rig' and 'agent'. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>