The peer now owns submit/cancel lifecycle: pendingSubmit retains the
original DevID per submit, CMD_UNLINK carries it (stub_rx valid_request
was silently rejecting devid=0), and RET_UNLINK finalizes the bound
transaction. UrbTransaction.Cancel delegates instead of assembling the
wire itself. Stale exports stay in linux and darwin host snapshots so
the ledger broadcasts unavailable State updates rather than Removed.
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