Function apply_continuous_effects 

pub fn apply_continuous_effects(game: &mut GameState)

Recompute all continuously-applied static-ability effects for the current game state.

This is the Rust equivalent of Java Forge’s GameAction.checkStaticAbilities() + StaticAbilityContinuous.applyContinuousAbility().

Call this after:

• Any permanent enters or leaves the battlefield.
• Any spell or ability resolves.
• Any triggered ability fires.
• Before querying can_attack() / can_block() for combat legality.