Plan is complete. Summary of the approach:

• 1 new script (sw-metrics-health.sh, ~450 lines) validates 5 data systems with per-system health scoring (0-100), weighted overall score, and auto-repair for structural failures
• 1 test suite (sw-metrics-health-test.sh, ~30 tests) covers unit/repair/integration scenarios including the critical inject-failures-then-repair cycle
• 3 small edits to existing files (CLI router, package.json, event schema)
• Minimal blast radius — no existing behavior changed, just new functionality added