release: 2.13.0: local-time - the panel in the container's time zone

No migration; schema 12. The pins (README, compose, guide), the guide's
backup example, the planned cuts and the roadmap row.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/development.md

@@ -107,7 +107,7 @@ than the default «meaningful step» rule in [§ Commits and release build](#com
 2. Git tag `vX.Y.Z` and publish the GitHub Release only on explicit request (see
    [§ Release image](#release-image)).
 
-**Planned version cuts** (from pin `2.12.0`; adjust if semver changes mid-track):
+**Planned version cuts** (from pin `2.13.0`; adjust if semver changes mid-track):
 
 | Stage | ID | Cut |
 |---|---|---|
@@ -149,6 +149,7 @@ than the default «meaningful step» rule in [§ Commits and release build](#com
 | 36 | origin-strict | `2.10.4` (PATCH) |
 | 37 | health-setup-checks | `2.11.0` |
 | 38 | test-email | `2.12.0` |
+| 39 | local-time | `2.13.0` |
 
 Docs-only prep (checklists in plans, no product code) uses the same per-step
 commit rule but **no** version cut until the next product stage ships.