Derive heartbeat cadence from the shared coordination frame

Assistant: codex
Assistant-Model: gpt-6-astra
Assistant-Session: 01a13eab-1e6a-7b33-9c37-372e90ada3a2

deploy/approval-engine.yaml

@@ -32,6 +32,8 @@ spec:
       app.kubernetes.io/name: approval-engine
   template:
     metadata:
+      annotations:
+        coordination.coulomb.social/frame-sha256: "d15e092387f128ffdfd00b9815707a05ff77c5bb0ba4d9a428fbc37b8c440b67"
       labels:
         app.kubernetes.io/name: approval-engine
     spec:
@@ -72,6 +74,8 @@ spec:
             - approval-engine
             - --jwks-url
             - http://keycape.sso.svc.cluster.local:8080/jwks
+            - --heartbeat-seconds
+            - "3600"
             - --audit-url
             - http://audit-core.audit-core.svc.cluster.local:8080
             - --audit-token-file