PLUGIN_HARDWARE_ONCE only suppresses retries of the initial attach;
when an established connection later drops, wsk_receive.cpp
unconditionally schedules background reattach attempts (~20 tries over
~2 hours) toward this session's dead one-shot loopback port. With
ephemeral port reuse those ghost connects steal a later session's
Accept and fail its Plugin. Wire up STOP_ATTACH_ATTEMPTS (0x805,
present in both bundled driver builds) and cancel the session's exact
host/service/busid location before plugout.
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