feat: support shared-workspace file flow for matrix

core/handlers/message.py

@@ -29,10 +29,15 @@ async def handle_message(event: IncomingMessage, auth_mgr, platform, chat_mgr, s
         user_id=event.user_id,
         chat_id=event.chat_id,
         text=event.text,
-        attachments=[],
+        attachments=event.attachments,
     )
 
     return [
         OutgoingTyping(chat_id=event.chat_id, is_typing=False),
-        OutgoingMessage(chat_id=event.chat_id, text=response.response, parse_mode="markdown"),
+        OutgoingMessage(
+            chat_id=event.chat_id,
+            text=response.response,
+            parse_mode="markdown",
+            attachments=list(getattr(response, "attachments", [])),
+        ),
     ]

core/protocol.py

@@ -12,6 +12,7 @@ class Attachment:
     content: bytes | None = None
     filename: str | None = None
     mime_type: str | None = None
+    workspace_path: str | None = None
 
 
 @dataclass