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f13da59f23
The spec's B table grows its fifth row: bridge add_nio_tap mints a transient TAP when the name is free and hardens it at creation, while an attach to an existing device (possibly a user-owned TAP with addresses) is left untouched. The rule paragraph spells out attach-is-not-a-creation. Delivery: uBridge fb72758, closing the gap the new e2e assertions found (live: the switch's gns3*-0 relay TAP carried fe80::). The server issues no link l2only of its own -- the switch call site now documents that the TAP is minted-and-hardened by add_nio_tap, and the ESW feature doc describes the uBridge-side close instead of a server workaround.