Resolved conflicts in AbstractDataAbilities, DataAbilities, PlayerAbilityData
to integrate both toggle system (upstream) and chain delay tracking (local).
ChainedAbility now has UUID and DisplayName fields matching Ability pattern.
ChainedAbilityController rewritten: saves in abilities/chained/, dual-index
by name and UUID, legacy migration from chained_abilities/ directory.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>