[codex] Make Doctor current-state aware

[dankritz]

Summary

• Make Doctor prefer the latest deployment state instead of diagnosing the newest historical failure.
• Return rootCauseCategory: healthy with a passed health-check result when the latest deployment succeeded and the app is running.
• Keep older failures as informational evidence so agents can see history without mistaking it for the current app state.
• Add regression coverage for a newer successful deployment superseding an older failed deployment.

Validation

• npm run typecheck --workspace @vibestack/api
• npm run test --workspace @vibestack/api -- doctor.test.ts
• npm test
• npm run build
• npm run lint

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (2 files)

• apps/api/src/doctor.test.ts - 0 issues
• apps/api/src/doctor.ts - 0 issues

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_{Reviewed by grok-code-fast-1 · 65,301 tokens}