feat: implement issue #1103 — cmd_rollback moves the bare <agent>/<ring> tag, not <agent>/v<M>-<ring> — the emergency lever is a silent no-op for every v-scoped agent

DO
2d ago
+123-5

User description

Closes #1103

Implemented by dev-lead agent. Please review.

CodeAnt-AI Description

Make rollback move the channel tag used by the fleet

What Changed

  • Rollback now targets the current major-version ring tag, such as dev-lead/v139-stable, when it exists
  • Rollback falls back to the legacy bare ring tag when the version-scoped tag is unavailable
  • Rollback now fails with a clear error when neither ring tag exists instead of completing as a silent no-op
  • Added coverage for version-scoped targets, legacy fallback, and missing-tag failures

Impact

✅ Rollbacks reach the channel used by version-scoped fleets
✅ No silent rollback no-ops
✅ Clearer missing-ring errors

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