choose_subnet is extracted with its helpers (the same awk seam as
subnet_claimant) and driven case by case against canned tables under the
shim ip: every pinned refusal unchanged (gateway-claimed, foreign
interface, disagreeing bridge, garbage — and a clearing pin used verbatim,
silently); bridge-present convergence to the bridge's own subnet with no
scan (case 2 precedes case 4) and no announcement on the plain default
re-run; the poisoned state (bridge AND uplink on one subnet) refusing
rather than converging; a free default staying 10.88; the nested tables
auto-picking 10.89 loudly, naming the DEFAULT GATEWAY claimant and the
BOX_SUBNET pin; a doubly-claimed host skipping to 10.90; and all 40
candidates claimed falling back to the old refusal, naming the end of the
scan range and BOX_SUBNET.
The driven whole-script fixtures move with the semantics: the refusal
paths now pin BOX_SUBNET=10.88.0.0/24 explicitly (the unpinned nested run
is no longer a refusal — it is the auto-pick, proven end to end: Host
ready, the announcement, and the bridge + ACL carve-out following the
pick to 10.89). The decision-precedes-mutation line-order check now pins
the choose_subnet call site. 339 → 370 checks.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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