Returns the entity whose own `_ownedLock` backs `lock` — the topmost ancestor of `entity` still sharing `lock` through propagation (item -> container, custom entity -> holder). The held-lock set must pin THIS entity, not a propagated child: a child can be reverted/reparented out of the cover mid-hold (e.g. an item moved off a critter that is then destroyed, or the container destroyed and its items
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