dc0 v4 node carve COMPLETE: 10/10 machines, gate 134/0, diff vs pre-migration EMPTY ...

Canary-first then node by node, never batched. 11 + 13x8 + 4 mutations, every one
read back. Nine role nodes on six planes with OVS br-ex; the juju controller on
two planes raw with no br-ex and enp3-6 left on auto VLANs.

Verified by diffing against the Office1 pre-migration capture: every node's six
v4 legs match address for address. Compared by LEG SET, since system_id and
hostname are both re-minted at re-enlistment.

Instrument note: the first extraction read the wrong capture field and returned
'-' for every old address, which would have read as 'the old region had no
statics'. Caught by the implausible shape, not by the parse.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HvCyrwvYTTcDYnRErfMsNf