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48dbdbe4a9
The bridge teardown only hung off the link-removal path, but deleting a
node or closing a project never issues a per-link delete — the veths
disappeared with their containers and left the bridge behind as an empty
orphan (reproduced: create a kernel link, DELETE the project, the
gns3{link_id} bridge survives). `_remove_kernel_veths` now deletes the
node's kernel-NIO bridges alongside the veth host ends: both endpoints do
it, the peer's still-enslaved port answers EBUSY (suppressed, last one
wins) exactly like link deletion, a relay NIO's uBridge bridge is left
alone (it dies with the process), and a node restart rebuilds the bridge
from the NIO in _connect_nio.
Found while cleaning up the window_drop e2e: seven such bridges had
accumulated on this host. Re-verified live: the bridge is gone after the
project delete, and the window_drop e2e (which includes a node restart
with the kernel link attached) still passes 15/15.