Function generate_handler_dispatch 

pub fn generate_handler_dispatch(
    handlers: &[HandlerSignature],
    model_name: &str,
    message_name: &str,
) -> Result<TokenStream, CodegenError>

Generate handler dispatch code for production mode

Converts dynamic handler registry lookups into static function calls for zero runtime overhead.

Arguments

• handlers - List of handler signatures
• model_name - Name of the model struct
• message_name - Name of the message enum

Returns

Generated match statement as TokenStream