Update stabilization checkpoint after staged promotion finish

docs/infrastructure-stabilization-pickup-checkpoint.md

@@ -25,7 +25,6 @@ State Hub active workstreams queried on 2026-06-27:
 | `cust-wp-0051` | This metaplan is the coordination layer for remaining cross-workplan gates. |
 | `activity-wp-0016-llm-output-robustness-trust-boundary` | Repo-side output robustness bundle is prepared; live deploy/smoke proof remains. |
 | `three-phoenix-ha-cluster` | HA substrate remains future critical-workload work, not the current State Hub cutover blocker. |
-| `staged-promotion-lifecycle` | T02 `railiance/app.toml` contract, T03 overlay repo pattern/script, T04 Stage 1 runner, T05 canary template, and T06 deploy/observe tooling are done; continue with T07 promote/rollback/onboarding before broad production migrations. |
 | `rail-ho-wp-0005` | Forgejo production migration is parked behind explicit design, SMTP, backup, runner, and cutover decisions. |
 | `net-wp-0020` | OpenBao unseal/token custody remains an operator design and smoke gate. |
 | `issue-wp-0003` | issue-core service is healthy; activity-core REST emission wiring remains. |
@@ -44,6 +43,9 @@ Hygiene status:
   cleared during this stabilization session.
 - `make fix-consistency REPO=the-custodian` still reports pre-existing C-12
   orphan-row warnings, but the relevant workplan lifecycle and task states sync.
+- `RAIL-BS-WP-0006-staged-promotion-lifecycle` is finished: all seven tasks
+  are done, the workstream is finished in State Hub, and the file frontmatter
+  is `status: finished`.
 
 ## Blocker Board
 
@@ -106,8 +108,8 @@ Resume from `docs/daily-triage-stabilization-status.md` and
    `ISSUE_SINK_TYPE=rest` and one known-safe emission smoke.
 5. Request explicit State Hub cutover approval for `CUST-WP-0011-T07`, or
    record that WSL2 remains primary for the next operating period.
-6. Continue staged-promotion T07 and start artifact-store D7.1/D7.2
-   so Forgejo and storage work inherit clear production promotion gates.
+6. Start artifact-store D7.1/D7.2; Forgejo and storage work can now inherit
+   the finished staged-promotion gates.
 7. Keep Forgejo cutover and State Hub HA work parked until their human decision
    and drill gates are satisfied.