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QEMU is the guest side of every adapter TAP, and uBridge's tap delete
refuses a device another process holds open ('Device or resource busy') —
a best-effort delete whose failure is suppressed. QEMU's stop did the
delete first and stopped the process after, so every node stop or project
delete leaked the persistent TAPs: found by inspecting the host after a
project delete (16 taps left behind, carrier down, no holder), and the
held-tap behaviour reproduced against uBridge directly.
Stop the QEMU process first, then remove the TAPs and the per-link kernel
bridges — process side first, then the devices, the same lesson as IOU's
reverse stop order. Verified live: node stop and project delete now leave
no taps and no processes behind, while a restart recreates the TAPs.
The adapter anchor naming also goes through the shared
utils.kernel_anchor helper, like the other node types.