fix(agent-jobs): recovery cron skips already-terminal jobs

packages/backend/convex/agentJobs.ts

@@ -1218,6 +1218,7 @@ export const recoverStaleJobs = internalMutation({
         .withIndex('by_status', (q) => q.eq('status', status))
         .collect();
       for (const job of jobs) {
+        if (isTerminalJob(job)) continue;
         const last = job.lastHeartbeatAt ?? job.claimedAt ?? job.createdAt;
         if (last > threshold) continue;
         const now = Date.now();