Mod callbacks

THE MODDING API DOCUMENTATION IS WIP

Callbacks	Called when
`_mod_ready()`	Once, right after your mod is loaded
`_on_game_loaded(success: bool)`	A save file finishes loading (or fails to)
`_on_game_close()`	The game is closing — save mod state here if needed
`_mod_tick(delta: float)`	Every physics frame
`_mod_render(delta: float)`	Every rendered frame

extends Node

func _mod_ready() -> void:
    DuckLoader.log_message("[MyMod] Hello, duck!")