docs: add runbook for failed Vercel deployment rollback

[Kriss255]

Overview

This PR adds a runbook for failed Vercel deployment rollback after auto-rollback events. It documents the rollback procedure, how to read Vercel deployment failure logs, and how to verify that a stable deployment has been restored.

Related Issue

Closes #

Changes

🔄 Rollback Runbook

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

  • Explains what triggers a Vercel auto-rollback and how recent failed deploys are handled.
  • Provides step-by-step rollback procedures using both the Vercel dashboard and Vercel CLI.
  • Includes verification steps to confirm the correct deployment is live.

• [ADD] runbook.md

  • Entry-point runbook linking to the detailed operations and troubleshooting guides.
  • Quick-reference commands for listing deployments, checking deployment status, and rolling back.

• [ADD] docs/operations/runbook.md

  • Operational runbook for triaging failed Vercel deployments.
  • Covers how to inspect deployment logs, identify common failure signatures, and decide between redeploying and rolling back.

• [MODIFY] docs/troubleshooting.md

  • Adds a "failed Vercel deployment rollback" section with common failure patterns.
  • Includes log-reading guidance and links to the new auto-rollback runbook.

Verification Results

Manual verification:
✅ Rollback steps verified against Vercel dashboard + CLI
✅ Log-reading examples match Vercel deployment output
✅ All cross-references resolve
✅ Markdown lint passes

Acceptance Criteria	Status
Rollback procedure is documented step-by-step	✅ Dashboard + CLI steps with verification
Deployment failure logs can be read and interpreted	✅ Common log patterns and failure signatures documented
Runbook is linked from troubleshooting docs	✅ docs/troubleshooting.md links to the new runbook
Auto-rollback behavior is explained	✅ Trigger conditions and rollback process documented

Closes #474

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