dispose method
void
dispose()
Releases the caller-side WASM bytes.
This is optional for process termination because request isolates are short-lived. Requests already submitted may finish; later requests fail. A builder created by ScTransactionBuilder.create owns its bridge and may call this during app teardown.
Implementation
void dispose() {
if (_disposed) return;
_disposed = true;
_wasmBytes = null;
}