Macro export_alloc 

macro_rules! export_alloc {
    () => { ... };
}

Export the guest alloc function the flaron host runtime requires.

Call this once at the crate root of your flare:

flaron_sdk::export_alloc!();

This expands to a #[no_mangle] extern "C" fn alloc(size: i32) -> i32 that delegates to guest_alloc. Without it, every host function that returns data to the guest will fail.

Most flares should use handle_request! or ws_handlers! instead - those macros include the alloc export for you.