fix: harden generated agent platform access

deploy/20-deployment.yaml

@@ -40,29 +40,11 @@ spec:
               value: "1200"
             - name: DEPLOY_WAIT_TIMEOUT_S
               value: "900"
-            - name: A2A_PLATFORM_SECRET
+            - name: A2A_GRANT_VERIFYING_KEY
               valueFrom:
-                secretKeyRef: {name: platform-secrets, key: platform_secret}
-            - name: A2A_LITELLM_URL
-              value: http://litellm.llm.svc.cluster.local:4000
-            - name: A2A_LITELLM_KEY
-              valueFrom:
-                secretKeyRef: {name: litellm-credentials, key: api_key}
-            - name: A2A_LITELLM_MODEL
-              value: gpt-5.5
+                secretKeyRef: {name: platform-secrets, key: grant_verifying_key}
             - name: A2A_CP_URL
               value: http://control-plane.control-plane.svc.cluster.local
-            - name: A2A_MINIO_ENDPOINT
-              value: http://microcash-infra-minio.microcash-infra.svc.cluster.local:9000
-            - name: A2A_MINIO_ACCESS_KEY
-              valueFrom:
-                secretKeyRef: {name: minio-credentials, key: access_key}
-            - name: A2A_MINIO_SECRET_KEY
-              valueFrom:
-                secretKeyRef: {name: minio-credentials, key: secret_key}
-            - name: A2A_SANDBOX_TOKEN
-              valueFrom:
-                secretKeyRef: {name: sandbox-auth, key: token}
           readinessProbe:
             httpGet: {path: /healthz, port: 8000}
             initialDelaySeconds: 8