feat!: remove close_session from session service as it is not implemented yet.

PiperOrigin-RevId: 759705443

Author: DeanChensj

src/google/adk/runners.py

@@ -327,16 +327,6 @@ async def run_live(
       await self.session_service.append_event(session=session, event=event)
       yield event
 
-  async def close_session(self, session: Session):
-    """Closes a session and adds it to the memory service (experimental feature).
-
-    Args:
-        session: The session to close.
-    """
-    if self.memory_service:
-      await self.memory_service.add_session_to_memory(session)
-    await self.session_service.close_session(session=session)
-
   def _find_agent_to_run(
       self, session: Session, root_agent: BaseAgent
   ) -> BaseAgent:

src/google/adk/sessions/base_session_service.py

@@ -91,10 +91,6 @@ async def delete_session(
   ) -> None:
     """Deletes a session."""
 
-  async def close_session(self, *, session: Session):
-    """Closes a session."""
-    # TODO: determine whether we want to finalize the session here.
-
   async def append_event(self, session: Session, event: Event) -> Event:
     """Appends an event to a session object."""
     if event.partial: