Derive heartbeat cadence from the shared coordination frame

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

approval_engine/audit.py

@@ -9,6 +9,7 @@ from typing import Any, Callable
 from urllib.error import HTTPError, URLError
 from urllib.request import Request, urlopen
 
+from .coordination import FRAME_SECONDS
 from .store import Engine
 
 
@@ -91,7 +92,7 @@ class OutboxWorker:
         engine: Engine,
         sink: Callable[[dict[str, Any]], None],
         *,
-        heartbeat_interval_seconds: int = 300,
+        heartbeat_interval_seconds: int = FRAME_SECONDS,
     ) -> None:
         self.engine = engine
         self.sink = sink

approval_engine/cli.py

@@ -8,6 +8,7 @@ from wsgiref.simple_server import make_server
 
 from .api import App
 from .audit import AuditCoreSink, OutboxWorker
+from .coordination import FRAME_SECONDS
 from .auth import Identity, JWTAuthenticator, StaticTokenAuthenticator
 from .store import Engine
 
@@ -45,7 +46,7 @@ def _parser() -> argparse.ArgumentParser:
     serve.add_argument("--audit-url")
     serve.add_argument("--audit-token-file")
     serve.add_argument("--outbox-poll-seconds", type=float, default=5)
-    serve.add_argument("--heartbeat-seconds", type=int, default=86400)
+    serve.add_argument("--heartbeat-seconds", type=int, default=FRAME_SECONDS)
     migrate = sub.add_parser("migrate", help="apply repeatable schema migrations")
     _common_db(migrate)
     verify = sub.add_parser("verify", help="verify schema and SQLite integrity")

approval_engine/coordination.py

@@ -0,0 +1,6 @@
+"""Generated cadence timings; regenerate with NetKingdom coordination-frame tool."""
+# Source: coordination-engine/config/coordination-frame.json
+FRAME_CONFIG_SHA256 = "d15e092387f128ffdfd00b9815707a05ff77c5bb0ba4d9a428fbc37b8c440b67"
+FRAME_SECONDS = 3600
+RECEIVER_WAIT_SECONDS = 7200
+EFFECTIVE_DEADLINE_SECONDS = 10800