Heartbeat every 30s while waiting on the approval workflow

The approval handler blocks on handle.result() for as long as the
operator takes to decide. AgenticSession only heartbeats between LLM
turns, so a multi-hour wait inside this handler would trigger
heartbeat timeout (default 120s) and kill the activity.

Spawn a ticker task that fires activity.heartbeat() every 30s for
the duration of the wait, cancelled in finally when handle.result()
returns. Survives realistic operator delays without churn.

Existing tests still pass (the test path uses a fake deps record
that doesn't go through this code path).

Author: lex00

tool_registry_incident_triage/triage_activity.py

@@ -367,4 +367,19 @@ async def _real_request_human_approval(
         # operator should not get a second prompt for the same incident.
         id_conflict_policy=WorkflowIDConflictPolicy.USE_EXISTING,
     )
-    return await handle.result()
+
+    # Heartbeat every 30 seconds while waiting on the approval workflow.
+    # AgenticSession only heartbeats between LLM turns, so a multi-hour
+    # operator wait inside this handler would otherwise trigger heartbeat
+    # timeout in 120s and kill the activity. The ticker keeps the activity
+    # alive until the operator decides.
+    async def _ticker() -> None:
+        while True:
+            await asyncio.sleep(30)
+            activity.heartbeat()
+
+    ticker_task = asyncio.create_task(_ticker())
+    try:
+        return await handle.result()
+    finally:
+        ticker_task.cancel()