- Add gt mq list <rig> command with table output
- Support --ready flag to show only unblocked MRs
- Support --status, --worker, --epic filtering
- Support --json output format
- Parse MR fields from beads issues for display
- Show blocking info for blocked MRs
Closes gt-svi.2
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>