- Create src/magical-objects/magical-object-types.ts with DamageDealer
and Healer interfaces
- MagicalWeapon implements DamageDealer
- HealingObject implements Healer
- Character depends on interfaces instead of concrete classes
- MagicalWeapon: fixed damage, owner-only, self-destructs at 0 HP
- HealingObject: heals characters up to both caps, self-destructs at 0 HP
- 18 fast-check properties covering rules and invariants
- Allium spec with entities, rules, and invariants
- Character.createWithHealthAndStatus factory method for status-aware creation