docs(cooking): describe snapshot restore of lost animals

[ryanbarlow97]

Documents TF-Minecraft/Cooking#58 in the husbandry guide.

• New Lost animals section: snapshot capture, restore at start, the ghost-drop fallback, the logged-out-rider check, which removals delete a snapshot, and the restore-lost-animals toggle.
• /animals: Missing now only appears for an animal that could not be restored. The old wording said every unfound animal shows Missing, which Describe the RPCharacters online player list #52 had already made untrue.
• World cleanup: removes the old line saying owned rows are always kept when the entity is missing. The Link the published VehicleFramework wiki #56 tamed/named/saddled exemption is left out on purpose, because fix: keep only Cooking-owned horses and explain claiming Cooking#57 reverts it.
• Defaults list gains restore-lost-animals: true.

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