Enforce caller-auth on flex-auth-user-engine and record the live A2 probe

Helm-adopted the kubectl-managed user-engine pin, promoted sha256:138aa347
warn then enforce. Reviewer volume needs fsGroup 65532; reviewer tokens
must use the API default audiences or TokenReview 401s on this k3s.
Live probe from user-engine-8569d7cb87-fp7px: 200 / 401 / 403. tenant-engine
is unchanged. tenancy.current.A stays 0 until that pin moves.

deploy/README.md

@@ -96,8 +96,8 @@ last-known-good digest below.
 | `flex-auth-tenant-engine` *(live until warn promote)* | `sha256:1bf060e61122693ce98359c167cc5fe8bdafc84e097e090eaa71af94d0f27cbc` | nine-action policy (FLEX-WP-0014), CI-built from `f304688` |
 | `flex-auth-tenant-engine` *(previous)* | `sha256:9320df394a642eff24da8af4a0ee8886a7bb78b0f14d8ee1deeb30ea8eeeaba7` | seven-action policy, FLEX-WP-0013 restore; guardrail actions deny `unknown_action` |
 | `flex-auth-tenant-engine` *(rollback)* | `sha256:c25fc34a6cd7e64d955f8723ec70e176a583d5ae71d76280c4e2d89fba0fe0aa` | four-action policy; lifecycle actions deny `unknown_action` |
-| `flex-auth-user-engine` | `sha256:138aa3471c46bca6e814691fa1e6520aedda3dffd743e6b09141ab433afdb64b` | **pin, not live** — caller-auth **warn** (FLEX-WP-0015-T02), CI `main-3de72fe` |
-| `flex-auth-user-engine` *(live until warn promote)* | `sha256:1f5290376dc5fcf456dc7a785e394d8b90949dabecd1d3e856f38557149bb5f4` | FLEX-WP-0009-T04, nine fixtures (incl. registration-applicant) verified live 2026-08-16 |
+| `flex-auth-user-engine` | `sha256:138aa3471c46bca6e814691fa1e6520aedda3dffd743e6b09141ab433afdb64b` | **live** — caller-auth **enforce** (FLEX-WP-0015-T02), CI `main-3de72fe`, A2 probe 2026-08-19 |
+| `flex-auth-user-engine` *(previous)* | `sha256:1f5290376dc5fcf456dc7a785e394d8b90949dabecd1d3e856f38557149bb5f4` | FLEX-WP-0009-T04, nine fixtures (incl. registration-applicant) verified live 2026-08-16 |
 | `flex-auth-user-engine` *(previous)* | `sha256:a31961c45215aa6baf3bc748c6741ab703c2c8325e61aa7983a355026195e51b` | FLEX-WP-0009-T03, six fixtures verified live 2026-08-10 |
 
 Rolling back the tenant-engine service to `c25fc34a…` restores fail-closed

deploy/flex-auth-tenant-engine.yaml

@@ -63,7 +63,10 @@ spec:
           name: flex-auth-reviewer
           readOnly: true
       securityContext:
+        fsGroup: 65532
+        runAsGroup: 65532
         runAsNonRoot: true
+        runAsUser: 65532
         seccompProfile:
           type: RuntimeDefault
       volumes:
@@ -72,7 +75,6 @@ spec:
           defaultMode: 0440
           sources:
           - serviceAccountToken:
-              audience: https://kubernetes.default.svc
               expirationSeconds: 3600
               path: token
           - configMap:

deploy/flex-auth-user-engine.yaml

@@ -25,7 +25,7 @@ spec:
         - --policy
         - /opt/flex-auth/examples/user-engine/policy_package.md
         - --caller-auth-mode
-        - warn
+        - enforce
         - --caller-kubernetes-url
         - https://10.43.0.1
         - --caller-binding
@@ -63,7 +63,10 @@ spec:
           name: flex-auth-reviewer
           readOnly: true
       securityContext:
+        fsGroup: 65532
+        runAsGroup: 65532
         runAsNonRoot: true
+        runAsUser: 65532
         seccompProfile:
           type: RuntimeDefault
       volumes:
@@ -72,7 +75,6 @@ spec:
           defaultMode: 0440
           sources:
           - serviceAccountToken:
-              audience: https://kubernetes.default.svc
               expirationSeconds: 3600
               path: token
           - configMap: