feat: support shared-workspace file flow for matrix

tests/adapter/matrix/test_send_outgoing.py

@@ -9,7 +9,7 @@ from adapter.matrix.handlers.confirm import make_handle_cancel, make_handle_conf
 from adapter.matrix.store import get_pending_confirm, set_room_meta
 from core.auth import AuthManager
 from core.chat import ChatManager
-from core.protocol import OutgoingUI, UIButton
+from core.protocol import Attachment, OutgoingMessage, OutgoingUI, UIButton
 from core.settings import SettingsManager
 from core.store import InMemoryStore
 from sdk.mock import MockPlatformClient
@@ -156,3 +156,39 @@ async def test_outgoing_ui_no_round_trip_uses_user_and_room_scope():
     assert "отменено" in result[0].text.lower()
     assert await get_pending_confirm(store, "@alice:example.org", "!confirm:example.org") is None
     assert await get_pending_confirm(store, "@bob:example.org", "!other:example.org") is not None
+
+
+async def test_send_outgoing_uploads_workspace_file_attachment(tmp_path, monkeypatch):
+    workspace_file = tmp_path / "surfaces" / "matrix" / "alice" / "room" / "inbox" / "result.txt"
+    workspace_file.parent.mkdir(parents=True, exist_ok=True)
+    workspace_file.write_text("ready")
+    monkeypatch.setenv("SURFACES_WORKSPACE_DIR", str(tmp_path))
+
+    client = SimpleNamespace(
+        upload=AsyncMock(return_value=(SimpleNamespace(content_uri="mxc://server/file"), {})),
+        room_send=AsyncMock(),
+    )
+
+    await send_outgoing(
+        client,
+        "!room:example.org",
+        OutgoingMessage(
+            chat_id="!room:example.org",
+            text="Файл готов",
+            attachments=[
+                Attachment(
+                    type="document",
+                    filename="result.txt",
+                    mime_type="text/plain",
+                    workspace_path="surfaces/matrix/alice/room/inbox/result.txt",
+                )
+            ],
+        ),
+    )
+
+    client.upload.assert_awaited_once()
+    client.room_send.assert_awaited()
+    assert client.room_send.await_args_list[0].args[2]["body"] == "Файл готов"
+    file_call = client.room_send.await_args_list[1]
+    assert file_call.args[2]["msgtype"] == "m.file"
+    assert file_call.args[2]["url"] == "mxc://server/file"