Add retry_count, last_conflict_sha, and conflict_task_id fields to MR bead
descriptions when created via `gt done`. These are initialized at creation
time and will be updated by the Refinery when handling merge conflicts.
- retry_count: 0 (number of conflict-resolution cycles)
- last_conflict_sha: null (SHA of main when conflict occurred)
- conflict_task_id: null (link to conflict-resolution task if any)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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