fix(gateway): route synthetic background events by session

tests/gateway/test_background_process_notifications.py

@@ -45,7 +45,7 @@ def _build_runner(monkeypatch, tmp_path, mode: str) -> GatewayRunner:
     monkeypatch.setattr(gateway_run, "_hermes_home", tmp_path)
 
     runner = GatewayRunner(GatewayConfig())
-    adapter = SimpleNamespace(send=AsyncMock())
+    adapter = SimpleNamespace(send=AsyncMock(), handle_message=AsyncMock())
     runner.adapters[Platform.TELEGRAM] = adapter
     return runner
 
@@ -243,3 +243,62 @@ async def test_no_thread_id_sends_no_metadata(monkeypatch, tmp_path):
     assert adapter.send.await_count == 1
     _, kwargs = adapter.send.call_args
     assert kwargs["metadata"] is None
+
+
+@pytest.mark.asyncio
+async def test_inject_watch_notification_routes_from_session_store_origin(monkeypatch, tmp_path):
+    from gateway.session import SessionSource
+
+    runner = _build_runner(monkeypatch, tmp_path, "all")
+    adapter = runner.adapters[Platform.TELEGRAM]
+    runner.session_store._entries["agent:main:telegram:group:-100:42"] = SimpleNamespace(
+        origin=SessionSource(
+            platform=Platform.TELEGRAM,
+            chat_id="-100",
+            chat_type="group",
+            thread_id="42",
+            user_id="123",
+            user_name="Emiliyan",
+        )
+    )
+
+    evt = {
+        "session_id": "proc_watch",
+        "session_key": "agent:main:telegram:group:-100:42",
+    }
+
+    await runner._inject_watch_notification("[SYSTEM: Background process matched]", evt)
+
+    adapter.handle_message.assert_awaited_once()
+    synth_event = adapter.handle_message.await_args.args[0]
+    assert synth_event.internal is True
+    assert synth_event.source.platform == Platform.TELEGRAM
+    assert synth_event.source.chat_id == "-100"
+    assert synth_event.source.chat_type == "group"
+    assert synth_event.source.thread_id == "42"
+    assert synth_event.source.user_id == "123"
+    assert synth_event.source.user_name == "Emiliyan"
+
+
+def test_build_process_event_source_falls_back_to_session_key_chat_type(monkeypatch, tmp_path):
+    runner = _build_runner(monkeypatch, tmp_path, "all")
+
+    evt = {
+        "session_id": "proc_watch",
+        "session_key": "agent:main:telegram:group:-100:42",
+        "platform": "telegram",
+        "chat_id": "-100",
+        "thread_id": "42",
+        "user_id": "123",
+        "user_name": "Emiliyan",
+    }
+
+    source = runner._build_process_event_source(evt)
+
+    assert source is not None
+    assert source.platform == Platform.TELEGRAM
+    assert source.chat_id == "-100"
+    assert source.chat_type == "group"
+    assert source.thread_id == "42"
+    assert source.user_id == "123"
+    assert source.user_name == "Emiliyan"

tests/gateway/test_internal_event_bypass_pairing.py

@@ -230,6 +230,59 @@ async def test_notify_on_complete_preserves_user_identity(monkeypatch, tmp_path)
     assert event.source.user_name == "alice"
 
 
+@pytest.mark.asyncio
+async def test_notify_on_complete_uses_session_store_origin_for_group_topic(monkeypatch, tmp_path):
+    import tools.process_registry as pr_module
+    from gateway.session import SessionSource
+
+    sessions = [
+        SimpleNamespace(
+            output_buffer="done\n", exited=True, exit_code=0, command="echo test"
+        ),
+    ]
+    monkeypatch.setattr(pr_module, "process_registry", _FakeRegistry(sessions))
+
+    async def _instant_sleep(*_a, **_kw):
+        pass
+    monkeypatch.setattr(asyncio, "sleep", _instant_sleep)
+
+    runner = GatewayRunner(GatewayConfig())
+    adapter = SimpleNamespace(send=AsyncMock(), handle_message=AsyncMock())
+    runner.adapters[Platform.TELEGRAM] = adapter
+    runner.session_store._entries["agent:main:telegram:group:-100:42"] = SimpleNamespace(
+        origin=SessionSource(
+            platform=Platform.TELEGRAM,
+            chat_id="-100",
+            chat_type="group",
+            thread_id="42",
+            user_id="user-42",
+            user_name="alice",
+        )
+    )
+
+    watcher = {
+        "session_id": "proc_test_internal",
+        "check_interval": 0,
+        "session_key": "agent:main:telegram:group:-100:42",
+        "platform": "telegram",
+        "chat_id": "-100",
+        "thread_id": "42",
+        "notify_on_complete": True,
+    }
+
+    await runner._run_process_watcher(watcher)
+
+    assert adapter.handle_message.await_count == 1
+    event = adapter.handle_message.await_args.args[0]
+    assert event.internal is True
+    assert event.source.platform == Platform.TELEGRAM
+    assert event.source.chat_id == "-100"
+    assert event.source.chat_type == "group"
+    assert event.source.thread_id == "42"
+    assert event.source.user_id == "user-42"
+    assert event.source.user_name == "alice"
+
+
 @pytest.mark.asyncio
 async def test_none_user_id_skips_pairing(monkeypatch, tmp_path):
     """A non-internal event with user_id=None should be silently dropped."""

tests/tools/test_watch_patterns.py

@@ -92,6 +92,25 @@ class TestCheckWatchPatterns:
         assert "disk full" in evt["output"]
         assert evt["session_id"] == "proc_test_watch"
 
+    def test_match_carries_session_key_and_watcher_routing_metadata(self, registry):
+        session = _make_session(watch_patterns=["ERROR"])
+        session.session_key = "agent:main:telegram:group:-100:42"
+        session.watcher_platform = "telegram"
+        session.watcher_chat_id = "-100"
+        session.watcher_user_id = "u123"
+        session.watcher_user_name = "alice"
+        session.watcher_thread_id = "42"
+
+        registry._check_watch_patterns(session, "ERROR: disk full\n")
+        evt = registry.completion_queue.get_nowait()
+
+        assert evt["session_key"] == "agent:main:telegram:group:-100:42"
+        assert evt["platform"] == "telegram"
+        assert evt["chat_id"] == "-100"
+        assert evt["user_id"] == "u123"
+        assert evt["user_name"] == "alice"
+        assert evt["thread_id"] == "42"
+
     def test_multiple_patterns(self, registry):
         """First matching pattern is reported."""
         session = _make_session(watch_patterns=["WARN", "ERROR"])