fix(agent-jobs): stop heartbeat from resurrecting terminated jobs

packages/backend/convex/agentJobs.ts

@@ -1223,6 +1223,7 @@ export const recoverStaleJobs = internalMutation({
         const now = Date.now();
         await ctx.db.patch(job._id, {
           status: 'timed_out',
+          workspaceStatus: 'expired',
           error:
             job.error ??
             'The worker stopped reporting progress; the job timed out.',
@@ -1512,12 +1513,15 @@ export const heartbeatWorkspace = mutation({
     if (job?.claimedBy !== args.workerId) {
       throw new ConvexError('Agent job not claimed by this worker.');
     }
+    if (isTerminalStatus(job.status)) {
+      return { success: true, cancelRequested: true };
+    }
     await ctx.db.patch(args.jobId, {
       workspaceStatus: 'active',
       lastHeartbeatAt: Date.now(),
       updatedAt: Date.now(),
     });
-    return { success: true, cancelRequested: job.status === 'cancelled' };
+    return { success: true, cancelRequested: false };
   },
 });