feat(cloud): enforce host governance budgets

apps/device-host-agent/host_agent/status.py

@@ -33,6 +33,7 @@ class AgentStatusTracker:
         self._lock = threading.Lock()
         self._current_assignment: _CurrentAssignment | None = None
         self._last_heartbeat: _LastHeartbeat | None = None
+        self._host_policy: dict[str, Any] | None = None
 
     def mark_assignment_started(self, assignment: AssignmentModel) -> None:
         with self._lock:
@@ -56,6 +57,19 @@ class AgentStatusTracker:
                 at=self._now(),
             )
 
+    def mark_host_policy(self, policy: Any | None) -> None:
+        with self._lock:
+            self._host_policy = (
+                {
+                    "revision": policy.revision,
+                    "self_submission_enabled": policy.self_submission_enabled,
+                    "max_active_tasks": policy.max_active_tasks,
+                    "daily_token_budget": policy.daily_token_budget,
+                }
+                if policy is not None
+                else None
+            )
+
     def snapshot(self) -> dict[str, Any]:
         with self._lock:
             current_assignment = self._current_assignment
@@ -81,4 +95,5 @@ class AgentStatusTracker:
                 if last_heartbeat is not None
                 else None
             ),
+            "host_policy": self._host_policy.copy() if self._host_policy else None,
         }