[EPIC] Certify and roll out IRC recoverable deletion

### Describe the proposal

Certify recoverable deletion in the deployment modes supported by the approved IRC design, explicitly gate unsupported modes, and publish safe configuration, upgrade, rollback, and operational guidance.

### Task list

- [ ] Validate the approved deployment-mode matrix.
- [ ] Implement and test configuration gating.
- [ ] Document upgrade, rollback, and operations procedures.
- [ ] Add supported-mode integration coverage.
- [ ] Publish release and adoption guidance.

Depends on: #12393, #12394, #12395, #12396, #12397

Related to: #12392