Function laminar_list_sources 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn laminar_list_sources(
    conn: *mut LaminarConnection,
    out: *mut *mut c_char,
) -> i32

List all sources as a JSON array (e.g., ["src1","src2"]). Caller frees with laminar_string_free.

Safety

conn and out must be valid non-null pointers.