feat: add rollback automation for GitHub releases

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Quality Gate Reference

• Checklist Item: CCD-008 (Rollback Strategy)
• Current Score: 0.50/1.0
• Impact: Medium — Tier 2 blocker
• Effort: Medium

Description

Rollback workflow exists on feat/autonomous-convergence but is not on main. Implement automatic rollback on release failure:

1. Post-release smoke test that validates the published artifact
2. On failure, use author/action-rollback to delete bad release and tag
3. Keep previous release installable

For CLI plugins: rollback = delete bad release + ensure previous release remains installable.

Implementation

1. Add post-release verification step in release.yml
2. Add author/action-rollback as conditional step on failure
3. Merge existing rollback.yml from PR chore: quality improvement 53.9 → 81.5 (tier 2) #1

Acceptance Criteria

• Release pipeline includes post-release verification
• Automatic rollback triggers on verification failure
• CCD-008 score improves
• All existing tests pass

References

• author/action-rollback
• Depends on: CI fixes (issue chore: quality improvement 53.9 → 81.5 (tier 2) #1)

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Resolution: Already Implemented on develop

The rollback automation is fully implemented on the develop branch and will reach main on next release merge.

Evidence

release.yml — Post-release verification + auto-rollback:

• verify-release job (lines 66–103): validates release exists, is marked latest, and tests pass at the release tag
• rollback-on-failure job (lines 104–161): on verification failure, deletes bad release, promotes previous release as latest, and creates a tracking issue

rollback.yml — Manual rollback workflow:

• workflow_dispatch with version/reason inputs
• Validates target tag exists, runs tests at rollback target, then promotes that release as latest
• Marks superseded release in its notes

Acceptance Criteria

• Release pipeline includes post-release verification
• Automatic rollback triggers on verification failure
• Manual rollback workflow available
• CCD-008 score should improve once merged to main