ai lover detail (Ai Lover)

Your lover NPC has needs, memories, goals, commitments, and
            autonomous household behavior.

            `talk <lover> = <message>` speaks directly.
            `say <message>` may be noticed by nearby NPCs.
            `agent <lover>` shows recent memories and commitments.

            If the LLM provider is unavailable, the game falls back to local
            responses and deterministic household behavior where possible.

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