The audit's claim against my lane, re-measured and CONFIRMED exactly: on the default
boot (synthetic 20261990, gigs default-ON) there are 14 posters, all 14 stand inside
e.width/2 — the bitumen ground.js paints — and 0 stand inside the ruled kerb
roadWidth/2. One refinement it did not make: 12 are spine posters at poleOffset=6m,
8m inside the paint (genuinely mid-road); 2 are frontage posters clipping the corridor
edge by 0.06m (FACADE_PROUD past their venue's facade plane).
WHY the gate was green: my placer seats posters via poleOffset, which is DERIVED FROM
roadWidth, and my selfcheck asserted clearance against roadWidth/2. Gate and subject
were the same function agreeing with itself — the R27 cross-convention trap recurring
inside the very file whose header explains it. It never read a number that came from
Lane B, so no change to where the road is painted could make it fail.
The correction (selfcheck.js, districtInvariants), three arms:
1. no poster on a carriageway — measured through vergeBand(e)[0], the published law
itself, the same call B's ground now consumes, so gate and renderer move together
2. every SPINE poster stands INSIDE some edge's vergeBand — the outer bound the old
check never had ("not on the road" also passed for a poster in a paddock).
Frontage exempt BY MEASUREMENT: 18/108 gig plans have a frontage poster past every
corridor edge (worst 3.98m, launceston_real) via plan_osm's lot setback.
Spine violations over the same corpus: 0/108.
3. THE CONTROL — count posters standing on bitumen under the PRE-RULING ground
(?verge=0, road quad = full e.width) and assert it is NOT ZERO on every gig plan
(min 3 / max 212 / never 0 across 510 plans), pinned at EXACTLY 14 on the default
boot. A control allowed to drift toward zero is how a gate goes vacuous.
The replica is pinned to B's FLAG, not to a line number that will drift.
FALSIFIABILITY PROVEN. Simulated ?verge=0 honestly — vergeBand switched to the
pre-ruling reading, poleOffset pinned to the true band so the PLACER stays
byte-identical (it is a render flag: paint changes, plan does not; fingerprint and
every gig golden green in both runs, so the gate's reading is the only variable):
corrected (R37) gate → FAIL, 1020 failures (2 arms x 510 plans)
pre-R37 (HEAD) gate → ALL GREEN 156,352/156,352 — structurally blind
GOLDENS: NOTHING MOVED, ZERO RE-PINS. 0x5f76e76, GIG_GOLDEN 0xec7a2d39, 25 base town
goldens and 24 real-town gig goldens all untouched — correct and predicted, since the
only generator-adjacent file changed is the selfcheck, which validates output and never
produces it. 156,352 -> 157,407 checks (+1,055), 10.3s.
Corridor law CONFIRMED for Lane B, semantics unchanged, contract published in full
(LANE_A_NOTES §37) with four hazards flagged loudly while B consumes it in parallel:
roadWidth and edge.width are both FULL widths but one is carriageway and one corridor
(that naming IS why this bug existed); lane's band is NOT the literal [2,2] the round
instructions state (2 synthetic edges are, 56 real lane edges are [4,4] — branch on
outer<=inner); arcade is all footpath with coincident kerbs to skip; the inward
extension never inverts (0 of 31,039 edges). Two charter numbers corrected: the "9m
band / 18m of every main" figures are synthetic-only — on every real town a main is
24m => 7m band, and the corpus's dominant edge is side@12 at 22,415/31,039 (72%) with
a 3m footpath.
FILED, NOT FIXED — v8 debt ledger, four entries (LANE_A_NOTES §37): D1 chunkIndex
(two impls, THREE divergences, header comment promises a swap that would break three
ways — owner B) · D2 isOpen (three impls + an ad-hoc fourth site; A's canonical one has
ZERO importers; the live shell copy treats no-hours as CLOSED where A's law says OPEN —
latent until v8 adds an hours-less lot — owner F) · D3 two shop registries (B's missing
all three venue kinds => buildings.js:344 renders op-shop signage on every gig venue
since R13 — owner B) · D4 NEW, mine: the poster gate's inner bound is NEAREST-EDGE and
an arcade (kerb 0) camouflages a real carriageway — 8 real-town plans hide a spine
poster up to 1.78m inside a main, 0 on synthetic. Cost measured decision-grade:
synthetic 0/4 plans move, 11/26 town gig goldens re-pin, poster counts unchanged.
Deferred to R38 on purpose — it moves plan output for a reason that is NOT the kerb
ruling, and the "did the kerb ruling move a golden?" answer must stay a clean no.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
e4d77629c5