ops: switch State Hub SBOM writes to Nexus

Assistant: codex
Assistant-Model: gpt-5.6-sol
Assistant-Session: 01a028f0-a42f-7582-89a8-ebaad7343834

deploy/railiance/apps/charts/state-hub/Chart.yaml

@@ -3,4 +3,4 @@ name: state-hub
 description: State Hub API service for private Railiance operation
 type: application
 version: 0.1.0
-appVersion: "main-9851809"
+appVersion: "main-b75234a"

deploy/railiance/apps/helm/state-hub-values.yaml

@@ -15,8 +15,8 @@ config:
   sbomNexusUrl: "http://sbom-nexus.sbom-nexus.svc.cluster.local:8010"
   # Reversible T04 read cutover; set back to `legacy` to roll back.
   sbomNexusReadMode: nexus
-  # Write authority moves only after the independently flagged image is live.
-  sbomNexusWriteMode: legacy
+  # Reversible T04 write cutover; set back to `legacy` to roll back future writes.
+  sbomNexusWriteMode: nexus
 
 resources:
   # The single 4-core node currently has less than 250m unallocated. Keep enough