Function handle_agent_workspace_read 

pub async fn handle_agent_workspace_read(
    __arg0: State<AppState>,
    headers: HeaderMap,
    __arg2: Path<String>,
    __arg3: Query<BrowseQuery>,
) -> Response

GET /api/agents/{alias}/workspace/read?path=<rel> — read a single file. Bounded by AGENT_WORKSPACE_READ_CAP.