Anchor the username-collision reclaim's UUID-keyed, proxy-detected design to
the multi-Yggdrasil reference: CaaMoe/MultiLogin v6 binds identity as
serviceId+online-UUID via "identity cards" that decouple the in-game name from
online identity — keyed by UUID, never by name. Note that §B3's Mojang-priority
reclaim goes beyond the common "protect the first-bound name" behavior by
evicting a squatter once the genuine Mojang owner appears and stashing the
squatter's data for the code-only inherit path.
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