Use party slot-based targeting for Arcane Mimicry

[Copilot]

Arcane Mimicry was using dynamic health/energy-based targeting which couldn't predictably target a specific player/hero and interfered with other HeroAI targeting functions.

Changes

Shared Memory

• Added ArcaneMimicryTargetSlot (c_int) to HeroAIOptionStruct
• Defaults to 0 (party leader), configurable per account

Skill Configuration

• Set TargetingStrict = False for Arcane Mimicry
• Enables fallback to standard OtherAlly targeting if party slot target invalid

Combat Targeting

• Implemented party slot lookup in GetAppropiateTarget()
• Validates target slot bounds, agent liveness, and self-targeting before returning
• Falls back silently on any validation failure

# Special handling for Arcane Mimicry - target based on party slot
if self.skills[slot].skill_id == self.arcane_mimicry:
    own_party_number = GLOBAL_CACHE.Party.GetOwnPartyNumber()
    if own_party_number != -1:
        hero_ai_options = GLOBAL_CACHE.ShMem.GetHeroAIOptions(...)
        if hero_ai_options is not None:
            target_slot = hero_ai_options.ArcaneMimicryTargetSlot
            players = GLOBAL_CACHE.Party.GetPlayers()
            if 0 <= target_slot < len(players):
                target_agent_id = GLOBAL_CACHE.Party.Players.GetAgentIDByLoginNumber(players[target_slot].login_number)
                if target_agent_id != 0 and GLOBAL_CACHE.Agent.IsAlive(target_agent_id):
                    if target_agent_id != GLOBAL_CACHE.Player.GetAgentID():
                        return target_agent_id

Users configure target via ArcaneMimicryTargetSlot in HeroAI options (0-based party index).

Original prompt

Arcane Mimicry HeroAI functionality isn't targeting the selected player/hero before casting. Can you make this simpler and have it just based off of party slot, and make sure HeroAI's other functions (targeting) and skills don't interfere.

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