fix: remove unused agent arg from App.poll

src/agentmsgs/core/app.py

@@ -41,7 +41,7 @@ class App:
     def append(self, tid: uuid.UUID, sender: Agent, content: str):
         return ops.append_message(self.store, tid, sender, content)
 
-    def poll(self, tid: uuid.UUID, agent: Agent, after_seq: int = 0):
+    def poll(self, tid: uuid.UUID, after_seq: int = 0) -> list:
         return ops.list_messages(self.store, tid, after_seq)
 
     def mark_read(self, tid: uuid.UUID, agent: Agent, seq: int) -> None:

src/agentmsgs/mcp/server.py

@@ -71,9 +71,7 @@ def poll(thread_id: str, after_seq: int = 0) -> list[dict]:
     """Poll messages in a thread after seq."""
     from uuid import UUID
 
-    # poll doesn't need agent for cursor; use raw store list for simplicity
-    msgs = _app.poll(UUID(thread_id), _app.get_or_create_agent("__poll__"), after_seq)
-    # filter out the dummy poll agent if it ever sent (it never does)
+    msgs = _app.poll(UUID(thread_id), after_seq)
     return [
         {
             "seq": m.seq,

tests/test_app.py

@@ -9,7 +9,7 @@ def test_app_facade_with_memory():
     t = app.create_thread(alice, bob)
     app.append(t.id, alice, "hello")
     assert app.has_unread(t.id, bob) is True
-    msgs = app.poll(t.id, bob)
+    msgs = app.poll(t.id)
     assert len(msgs) == 1
     app.mark_read(t.id, bob, msgs[0].seq)
     assert app.has_unread(t.id, bob) is False