Bus ids are positional: after a server restart or a replug the same
busid can carry an arbitrary other device, and a worker retries its
last busid every few seconds — it would import (and expose to the local
USB stack) whatever now sits on that port, e.g. an input device in
place of the intended one. OP_REP_IMPORT already carries the identity,
so each attach now checks the reply busid round-trips and the
vendor/product (and serial where available, with the control snapshot
as fallback) still match the rule the worker serves.
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