feat(FN-1348): export HeartbeatMonitor and HeartbeatTriggerScheduler from @fusion/engine

packages/dashboard/app/api.ts

@@ -3074,6 +3074,11 @@ export function fetchMissionHealth(missionId: string, projectId?: string): Promi
   return api<MissionHealth>(withProjectId(`/missions/${encodeURIComponent(missionId)}/health`, projectId));
 }
 
+/** Fetch health metrics for all missions in a single batched request. */
+export function fetchMissionsHealth(projectId?: string): Promise<Record<string, MissionHealth>> {
+  return api<Record<string, MissionHealth>>(withProjectId("/missions/health", projectId));
+}
+
 /** Add milestone to mission */
 export function createMilestone(
   missionId: string,

packages/dashboard/app/components/MissionManager.tsx

@@ -71,6 +71,7 @@ import {
   startMissionAutopilot,
   stopMissionAutopilot,
   fetchMissionHealth,
+  fetchMissionsHealth,
   fetchMissionEvents,
 } from "../api";
 import type { AutopilotStatus as AutopilotStatusType, AutopilotState } from "./mission-types";
@@ -429,21 +430,14 @@ export function MissionManager({ isOpen, isInline = false, onClose, addToast, pr
       return;
     }
 
-    const healthResults = await Promise.allSettled(
-      missionList.map(async (mission) => {
-        const health = await fetchMissionHealth(mission.id, projectId);
-        return [mission.id, health] as const;
-      }),
-    );
+    // Use batched endpoint for optimal performance (1 request instead of N)
+    const healthRecord = await fetchMissionsHealth(projectId);
 
     setMissionHealthById((prev) => {
       const next = new Map(prev);
-      for (const result of healthResults) {
-        if (result.status === "fulfilled") {
-          const [missionId, health] = result.value;
-          if (isMissionHealth(health)) {
-            next.set(missionId, health);
-          }
+      for (const [missionId, health] of Object.entries(healthRecord)) {
+        if (isMissionHealth(health)) {
+          next.set(missionId, health);
         }
       }
       return next;

packages/dashboard/src/mission-routes.ts

@@ -251,22 +251,34 @@ export function createMissionRouter(
   /**
    * GET /api/missions
    * List all missions ordered by createdAt desc, with status summary
+   * Uses batched query for optimal performance.
    */
   router.get(
     "/",
     catchTypedHandler(async (_req, res) => {
-      const missions = missionStore.listMissions();
-      // Sort by createdAt desc
-      missions.sort((a, b) => new Date(b.createdAt).getTime() - new Date(a.createdAt).getTime());
-      // Attach status summary to each mission
-      const missionsWithSummary = missions.map((mission) => ({
-        ...mission,
-        summary: missionStore.getMissionSummary(mission.id),
-      }));
+      const missionsWithSummary = missionStore.listMissionsWithSummaries();
       res.json(missionsWithSummary);
     })
   );
 
+  /**
+   * GET /api/missions/health
+   * Get health metrics for all missions in a single batched request.
+   * Returns a map of mission ID → health object.
+   */
+  router.get(
+    "/health",
+    catchTypedHandler(async (_req, res) => {
+      const healthMap = missionStore.listMissionsHealth();
+      // Convert Map to Record for JSON serialization
+      const result: Record<string, ReturnType<typeof healthMap.get>> = {};
+      for (const [missionId, health] of healthMap) {
+        result[missionId] = health;
+      }
+      res.json(result);
+    })
+  );
+
   /**
    * POST /api/missions
    * Create a new mission