test: drain heartbeat work before deleting recovery fixtures

Co-Authored-By: Paperclip <noreply@paperclip.ing>

server/src/__tests__/heartbeat-process-recovery.test.ts

@@ -548,7 +548,9 @@ describeEmbeddedPostgres("heartbeat orphaned process recovery", () => {
     }
     await new Promise((resolve) => setTimeout(resolve, 50));
     await waitForHeartbeatIdle(db, 5_000);
-    await new Promise((resolve) => setTimeout(resolve, 100));
+    // Terminal rows do not mean their background finalizers have returned.
+    // Drain tracked wakeups too: one can still create a run after the row poll.
+    await heartbeatService(db).drainActiveRunExecutions();
     await db.delete(activityLog);
     await db.delete(agentRuntimeState);
     await db.delete(companySkills);