D39 = B: 09 §3 decision 255 (the security-fix step) + a dated note on decision 13; capability B23; R-1239 closed, R-1240 opened, R-1238 updated (register 186 -> 186); STATUS/CONTEXT; nodes.md (9202 password, Tester 1 DHCP); evidence security-lane-2026-10-23 (controller 0.341.0, global floor 11:24 UTC)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012qRErfCoiTkvDK9N5XHbzb

documentation/architecture/00-capability-map.md

@@ -124,6 +124,7 @@
 | <a id="b20"></a>[B20](capability-map-detail/B.md#b20) | App crashes → customer notified (one event per transition, no flapping spam) | controller v0.120, hub v0.48 | **IMPLEMENTED** | crash→customer mail never live-confirmed | `audits/CAMPAIGN-3-2026-07-11.md` (2026-07-11) |
 | <a id="b21"></a>[B21](capability-map-detail/B.md#b21) | Post-deploy optional config (API keys etc.) with restart | controller, catalog `.felhom.yml` | **IMPLEMENTED** | config-save + restart in no campaign | `tests/CAMPAIGN-2-2026-07-07.md` (2026-07-07) |
 | <a id="b22"></a>[B22](capability-map-detail/B.md#b22) | Backup classification: 13 bind-bearing apps carry mandatory/optional/excluded classes | catalog, controller v0.132–133 | **PROVEN-LIVE** | — | `audits/SPIKE-backup-classification-2026-07-14.md` (2026-07-14); `audits/CAMPAIGN-6D-2026-07-15.md` (2026-07-15) |
+| <a id="b23"></a>[B23](capability-map-detail/B.md#b23) | An urgent security fix reaches the boxes at night — a `security_fix` ladder step (box walk required, bench optional, a CVE/GHSA notice), taken by the night update (`09` §3 decision 255, D39 = B) | catalog `3898593`, controller v0.341.0 | **PROVEN-LIVE** | scratch 9202 (drill catalog), Plex 1.43.4 → 1.43.5; an app with no box fixture is checked by health, version and a soak only (`seed: none`) | `audits/security-lane-2026-10-23/` (2026-10-23) |
 
 ## C. Protection & recovery (the product promise)