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Eagerly instantiates the Lua VM and registers the per-tick task (if the script declares on_game_tick) WITHOUT firing any hook. Hosts that dispatch their own spawn event (e.g. EliteMobs bosses, whose on_spawn arrives as a separate event) call this on creation so a tick-only script still gets its tick loop — instead of relying on the first hook dispatch. Idempotent and safe to call once at startup.