Based on oracle feedback:
- Add parseChecks() helper for check normalization and validation
- Supports synonyms: dupes→duplicates, git-conflicts→conflicts
- Case-insensitive, whitespace-tolerant parsing
- Deduplicates repeated checks while preserving order
- Returns error for unknown checks (exit code 2)
- Fix JSON output robustness
- Serialize errors as strings, not objects
- Add 'failed' boolean per check
- Fix 'healthy' to include error state
- Improve error handling
- hasFailures() now includes check errors
- Exit code 1 for any failures (issues or errors)
- Exit code 2 for usage errors (invalid checks)
- Optimize database access
- Single SearchIssues() call shared across checks
- Only fetch if needed (orphans/duplicates/pollution)
- Stabilize output ordering
- Print checks in deterministic order (not map iteration)
- Use result.name for display labels
- Better UX
- Unknown checks fail fast with helpful message
- Deterministic output for CI/scripting
- More robust JSON for machine consumption
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