Optional CONTENT-DERIVED remapping: when implemented, instantiate() derives each
clone's id FROM the original id instead of drawing from the sequence — same
original always maps to the same clone id (order-independent, stable across
loads). Opt-in so existing sequence-based providers (networking spawn dedup)
keep their behavior.
Optional CONTENT-DERIVED remapping: when implemented, instantiate() derives each clone's id FROM the original id instead of drawing from the sequence — same original always maps to the same clone id (order-independent, stable across loads). Opt-in so existing sequence-based providers (networking spawn dedup) keep their behavior.