P6: S3 blob store, Helm chart, air-gapped installer verify loop

- S3BlobStore (object_store, path-style) behind the same BlobStore trait,
  tested against a REAL MinIO container (round trip, overwrite, NotFound
  on get and delete, nested keys); [storage] backend=local|s3 config with
  validation + server-side selection (S3 creds via env overlay)
- Helm chart: server pod with the secret broker as a SIDECAR sharing a
  private emptyDir unix socket (no network hop carries credentials),
  frontend, optional local PVC vs S3, OIDC/oauth values, unbuffered-SSE
  ingress annotations, NetworkPolicies (frontend->server only), hardened
  securityContexts; ci/check-helm.sh lints AND asserts the rendered
  topology properties
- deploy/airgapped/install.sh: offline signature+checksum verification via
  the bundled teamclaw-bundler BEFORE any docker load; --verify-only mode;
  ci/test-install.sh rehearses clean/tampered/wrong-key paths with the
  real binary
- CI: helm gate + installer rehearsal wired in

149 Rust tests; helm lint + rendered assertions green; installer
verify-path rehearsal green.

Co-Authored-By: Claude Fable 5 <[email protected]>

deploy/helm/teamclaw/templates/_helpers.tpl

@@ -0,0 +1,20 @@
+{{- define "teamclaw.labels" -}}
+app.kubernetes.io/name: teamclaw
+app.kubernetes.io/instance: {{ .Release.Name }}
+app.kubernetes.io/managed-by: {{ .Release.Service }}
+{{- end }}
+
+{{- define "teamclaw.serverSelector" -}}
+app.kubernetes.io/name: teamclaw
+app.kubernetes.io/component: server
+{{- end }}
+
+{{- define "teamclaw.brokerSelector" -}}
+app.kubernetes.io/name: teamclaw
+app.kubernetes.io/component: broker
+{{- end }}
+
+{{- define "teamclaw.frontendSelector" -}}
+app.kubernetes.io/name: teamclaw
+app.kubernetes.io/component: frontend
+{{- end }}