fix: Agent survives slow Hub on large syncs (25-product chunks, 120s timeout, retry) and keeps heartbeating during jobs; 1.1.4

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

agent/tests/test_zero_touch_agent.py

@@ -1,6 +1,7 @@
 """Agent side of the zero-touch model: delta sync via fingerprint cache, read-only guarantee,
 blockers/operational summary in the job result, central pause, Firebird credential resolution."""
 import json
+import time
 
 import pytest
 
@@ -125,3 +126,23 @@ def test_central_resume_after_pause_makes_agent_poll_again(monkeypatch, tmp_path
     monkeypatch.setattr(service.time, "sleep", lambda s: None)
     service.run(_config(agent_id="2", poll_interval_seconds=0, state_db=str(tmp_path / "a.db")), {"AGENT_ID": "2"}, stopper=stopper)
     assert calls["next_job"] == 1  # first cycle paused (no poll), second cycle resumed (polled)
+
+
+def test_heartbeats_keep_flowing_while_a_long_job_runs(monkeypatch, tmp_path):
+    beats = []
+
+    class Hub:
+        def identity(self): return {"agent_id": 2, "installation_id": "00000000-0000-4000-8000-000000000222"}
+        def heartbeat_metadata(self, payload): beats.append(payload["status"]); return {"processing_enabled": True}
+        def next_job(self): return {"job_id": 5, "kind": "INITIAL_SYNC", "agent_id": 2, "payload": {}}
+        def complete_job(self, job_id, summary): stopper.stop = True
+        def fail_job(self, job_id, error): stopper.stop = True
+
+    class Stopper: stop = False
+    stopper = Stopper()
+    monkeypatch.setattr(service, "BUSY_HEARTBEAT_SECONDS", 0.05)
+    monkeypatch.setattr(service, "HubClient", lambda *a, **k: Hub())
+    monkeypatch.setattr(service, "load_executor", lambda: _FakeExecutor())
+    monkeypatch.setattr(service, "execute_job", lambda *a, **k: (time.sleep(0.4), ({"ok": 1}, None))[1])
+    service.run(_config(agent_id="2", poll_interval_seconds=0, state_db=str(tmp_path / "a.db")), {"AGENT_ID": "2"}, stopper=stopper)
+    assert beats.count("BUSY") >= 3  # heartbeats during the job, not only before it