Function handle_agent_memory_history 

pub(super) async fn handle_agent_memory_history(
    __arg0: State<AppState>,
    caller: Option<Extension<Caller>>,
    __arg2: Query<AgentMemoryHistoryQuery>,
) -> impl IntoResponse

GET /api/v1/agent/memory/history?agent_id=<slug>&filename=<f> — list every recorded version of one memory file, newest first. Backs the MemoryHistory MCP tool.