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addCombatant now accepts an optional init parameter for pre-filled stats (HP, AC, initiative, creatureId, color, icon, playerCharacterId), making combatant creation a single atomic operation with domain validation. This eliminates the multi-step store.save() bypass in addFromBestiary and addFromPlayerCharacter, and removes the CombatantOpts/applyCombatantOpts helpers. Also extracts shared initiative sort logic into initiative-sort.ts used by both addCombatant and setInitiative. Closes #15 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>