Function grant_unlocked_laws

pub fn grant_unlocked_laws(
    config: &GameConfig,
    cores: &mut CoresState,
    side: WorldSide,
) -> usize

Grants every law side’s core has earned at its CURRENT level, and reports how many were new.

Idempotent by construction: an owned law is skipped whole, so re-upgrading, replaying an event or backfilling never adds a copy. That matters because copies are the law upgrade currency — a duplicate grant would be free progression, not a cosmetic double.

A granted law is a plain level-1 OwnedLaw with zero copies, unslotted: identical to what the first random copy drop used to produce, so nothing downstream has to tell a granted law from a dropped one.