refactor: route file edit progress via channel capability

tests/agent/test_loop_progress.py

@@ -283,7 +283,7 @@ class TestToolEventProgress:
         assert finish["result"] == "file.txt"
 
     @pytest.mark.asyncio
-    async def test_bus_progress_forwards_file_edit_events_for_websocket_only(self, tmp_path: Path) -> None:
+    async def test_bus_progress_forwards_file_edit_events_without_channel_branch(self, tmp_path: Path) -> None:
         bus = MessageBus()
         provider = MagicMock()
         provider.get_default_model.return_value = "test-model"
@@ -299,27 +299,18 @@ class TestToolEventProgress:
             "status": "editing",
         }]
 
-        websocket_progress = await loop._build_bus_progress_callback(InboundMessage(
-            channel="websocket",
+        progress = await loop._build_bus_progress_callback(InboundMessage(
+            channel="telegram",
             sender_id="u1",
             chat_id="chat1",
             content="edit",
         ))
-        assert on_progress_accepts_file_edit_events(websocket_progress) is True
-        await websocket_progress("", file_edit_events=edit_events)
+        assert on_progress_accepts_file_edit_events(progress) is True
+        await invoke_file_edit_progress(progress, edit_events)
         outbound = await bus.consume_outbound()
+        assert outbound.channel == "telegram"
         assert outbound.metadata["_file_edit_events"] == edit_events
 
-        telegram_progress = await loop._build_bus_progress_callback(InboundMessage(
-            channel="telegram",
-            sender_id="u1",
-            chat_id="chat2",
-            content="edit",
-        ))
-        assert on_progress_accepts_file_edit_events(telegram_progress) is False
-        await invoke_file_edit_progress(telegram_progress, edit_events)
-        assert bus.outbound_size == 0
-
     @pytest.mark.asyncio
     async def test_goal_turn_keeps_live_file_edit_progress_for_webui(self, tmp_path: Path) -> None:
         """The /goal command rewrites the prompt but must not bypass WebUI file-edit progress."""

tests/channels/test_channel_manager_reasoning.py

@@ -37,6 +37,7 @@ class _MockChannel(BaseChannel):
         self._send_mock = AsyncMock()
         self._delta_mock = AsyncMock()
         self._end_mock = AsyncMock()
+        self._file_edit_mock = AsyncMock()
 
     async def start(self):  # pragma: no cover - not exercised
         pass
@@ -53,6 +54,9 @@ class _MockChannel(BaseChannel):
     async def send_reasoning_end(self, chat_id, metadata=None):
         return await self._end_mock(chat_id, metadata)
 
+    async def send_file_edit_events(self, chat_id, edits, metadata=None):
+        return await self._file_edit_mock(chat_id, edits, metadata)
+
 
 @pytest.fixture
 def manager() -> ChannelManager:
@@ -195,6 +199,44 @@ async def test_base_channel_reasoning_primitives_are_noop_safe():
     ) is None
 
 
+@pytest.mark.asyncio
+async def test_file_edit_events_route_to_channel_capability(manager):
+    channel = manager.channels["mock"]
+    edits = [{"version": 1, "phase": "start", "path": "src/app.py"}]
+    msg = OutboundMessage(
+        channel="mock",
+        chat_id="c1",
+        content="",
+        metadata={"_progress": True, "_file_edit_events": edits},
+    )
+
+    await manager._send_once(channel, msg)
+
+    channel._file_edit_mock.assert_awaited_once_with(
+        "c1", edits, {"_progress": True, "_file_edit_events": edits}
+    )
+    channel._send_mock.assert_not_awaited()
+
+
+@pytest.mark.asyncio
+async def test_base_channel_file_edit_events_are_noop_safe():
+    class _Plain(BaseChannel):
+        name = "plain"
+        display_name = "Plain"
+
+        async def start(self):  # pragma: no cover
+            pass
+
+        async def stop(self):  # pragma: no cover
+            pass
+
+        async def send(self, msg):  # pragma: no cover
+            raise AssertionError("file edit events should not call send")
+
+    channel = _Plain({}, MessageBus())
+    assert await channel.send_file_edit_events("c", [{"path": "a.py"}]) is None
+
+
 @pytest.mark.asyncio
 async def test_reasoning_routing_does_not_consult_send_progress(manager):
     """`show_reasoning` is orthogonal to `send_progress` — turning off