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Phase 12 of the deploy-hardening I master bundle. NEW docs/deployment-atomicity.md (12 sections, ~280 lines): 1. Overview — the three procurement-checklist gaps closed 2. The atomic-write primitive (Plan / File / Apply algorithm) 3. Per-connector atomic contract table (all 13 connectors) 4. Post-deploy TLS verification (handshake + SHA-256 + retries) 5. Rollback semantics (3 triggers + escalation path) 6. ValidateOnly dry-run mode (per-connector matrix) 7. File ownership + mode preservation (precedence + per-distro defaults) 8. Per-target deploy mutex (Phase 2) 9. Idempotency via SHA-256 (defends against retry storms) 10. Troubleshooting matrix (one row per failure mode) 11. V3-Pro deferrals (multi-region, pin manifests, SOC 2 export) 12. Per-connector quick reference (paste-able config snippets) UPDATE README.md::Deployment Targets — every connector row now notes the atomic + verify + rollback semantics that landed in deploy-hardening I. Added a closing paragraph linking to the new docs/deployment-atomicity.md. UPDATE docs/features.md — two new env-var rows: - CERTCTL_DEPLOY_BACKUP_RETENTION (default 3, -1 disables) - CERTCTL_K8S_DEPLOY_KUBELET_SYNC_TIMEOUT (default 60s) The G-3 docs-drift CI guard is satisfied: every new CERTCTL_DEPLOY_* env var documented here also appears in source (internal/deploy/types.go for BACKUP_RETENTION, k8ssecret config for KUBELET_SYNC_TIMEOUT). S-1 stale-counts guard: no literal-number current-state counts in the new doc — the per-connector tests are referenced via the file:line pattern (internal/connector/target/<name>/<name>_atomic_test.go) so the operator can grep for the actual count. Phase 13 next: pre-commit verification (full matrix + CI guard reproductions).