Implement Phase 3 of gate evaluation: GitHub gates (gh:run and gh:pr).
## Changes
- Add `bd gate check` command to evaluate open gates
- Support --type=gh to check all GitHub gates
- Support --type=gh:run for GitHub Actions workflow run gates
- Support --type=gh:pr for pull request merge status gates
- Add --dry-run flag to preview gate resolution without closing
- Auto-close gates when conditions are met:
- gh:run: workflow completed with success
- gh:pr: PR merged
- Escalate when conditions fail:
- gh:run: workflow failed or cancelled
- gh:pr: PR closed without merging
- Add unit tests for shouldCheckGate filtering
Note: mol-refinery-patrol.formula.toml updated in gastown rig to include
check-github-gates step (version 4).
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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