feat: support shared-workspace file flow for matrix

tests/core/test_integration.py

@@ -23,11 +23,11 @@ from core.protocol import (
 
 class FakeAgentApi:
     def __init__(self) -> None:
-        self.calls: list[str] = []
+        self.calls: list[tuple[str, list[str]]] = []
         self.last_tokens_used = 0
 
-    async def send_message(self, text: str):
-        self.calls.append(text)
+    async def send_message(self, text: str, attachments: list[str] | None = None):
+        self.calls.append((text, attachments or []))
         yield type("Chunk", (), {"text": f"[REAL] {text}"})()
         self.last_tokens_used = 5
 
@@ -130,4 +130,31 @@ async def test_full_flow_with_real_platform_uses_shared_agent_api(real_dispatche
     texts = [r.text for r in result if isinstance(r, OutgoingMessage)]
 
     assert texts == ["[REAL] Привет!"]
-    assert agent_api.calls == ["Привет!"]
+    assert agent_api.calls == [("Привет!", [])]
+
+
+async def test_full_flow_with_real_platform_forwards_workspace_attachment(real_dispatcher):
+    dispatcher, agent_api = real_dispatcher
+
+    start = IncomingCommand(user_id="u1", platform="matrix", chat_id="C1", command="start")
+    await dispatcher.dispatch(start)
+
+    msg = IncomingMessage(
+        user_id="u1",
+        platform="matrix",
+        chat_id="C1",
+        text="Посмотри файл",
+        attachments=[
+            Attachment(
+                type="document",
+                filename="report.pdf",
+                mime_type="application/pdf",
+                workspace_path="surfaces/matrix/u1/room/inbox/report.pdf",
+            )
+        ],
+    )
+    await dispatcher.dispatch(msg)
+
+    assert agent_api.calls == [
+        ("Посмотри файл", ["surfaces/matrix/u1/room/inbox/report.pdf"])
+    ]