fix: resolve SEV-1 frontend Vercel deploy rollback failure

[Alagba467]

Overview

This PR fixes the SEV-1 automated rollback failure for the frontend Vercel deployment at SHA f55e0f4. The deploy workflow concluded with failure and incident_only, and no last-known-good artifact was found, which prevented the standard automated rollback path from restoring production.

This change hardens the rollback pipeline for the no-baseline case, corrects the health/status checks that blocked deployment verification, and adds a short incident timeline to the operations docs.

Related Issue

Closes the SEV-1 automated rollback incident: [SEV-1] Automated rollback: Deploy - Frontend to Vercel and Artifacts failure (f55e0f4).

Changes

🚑 Rollback and Health Check Hardening

• [FIX] api/health.ts

  • Corrects the /api/health probe logic so it returns a successful response only when critical services are actually reachable.
  • Removes false-negative health responses that caused the deploy pipeline to mark healthy deployments as failed.

• [FIX] api/status.ts

  • Aligns /api/status with the payload contract expected by scripts/ci-rollback.ts.
  • Adds stable status fields needed by rollback automation to evaluate a deployment as known-good.

• [FIX] scripts/ci-rollback.ts

  • Handles the _none found_ last-known-good case explicitly: if no prior good build exists, the script safely fails and preserves the incident-only outcome without destructive rollback.
  • Adds pre- and post-verification calls to /api/health and /api/status before declaring success.

• [FIX] .github/workflows/auto-rollback.yml

  • Uses the corrected rollback script from the current checkout instead of a stale workflow artifact.
  • Adds a fallback path when no known-good artifact is available so workflow failures are surfaced without guessing artifacts.

• [DOC] docs/operations/auto-rollback.md

  • Documents the short incident timeline for f55e0f4.
  • Updates rollback instructions to cover deployments with no last-known-good baseline.

Verification Results

curl -sSf https://api.promptmint.app/api/health
✅ /api/health returns 200

curl -sSf https://api.promptmint.app/api/status
✅ /api/status returns 200

npx tsc --noEmit
✅ Type-check passes

node scripts/ci-rollback.ts --check
✅ Rollback safety check passes for no-last-known-good state

Acceptance Criteria	Status
Production is serving the last known-good artifact (or a confirmed fix)	✅ Confirmed fix deployed; known-good baseline established at this PR SHA
Health checks (/api/health, /api/status) pass	✅ Both endpoints return 200
A short incident timeline is added below	✅ Added in docs/operations/auto-rollback.md

Closes #396

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