Verified fresh Chromium across 9 town configs (synthetic, 3 fixtures, 5 real).
TRAM RULING (ledger #3): spinePolyline now walks from each main-subgraph dead-end, greedily taking the
unused main edge fronting the most shops (lot.frontEdge), keeping the best-scoring path (ties -> longer).
SYNTHETIC + FIXTURES BYTE-IDENTICAL by construction AND measurement (a synthetic main node has <=2 mains so
there's never a choice; its two dead-ends tie exactly and strict > keeps the pre-R20 start). Old vs new
logic on the same plan = identical polylines (Boolarra: 7 pts, 6 edges, 810m, 172 shops, 2 stops).
The alpha tram fronted 0 shops on 4 of 5 real towns (it was a highway bus). New: katoomba 0->3, newtown
0->8, fremantle 0->2, bendigo 0->1, castlemaine 1->6. Where the best main chain still fronts <5 shops the
tram is FENCED per-town (Fable's fallback). RUNS: synthetic, all fixtures, newtown (8 shops/1924m/16 stops),
castlemaine (6/2184m/10 stops). FENCED: katoomba (3), fremantle (2), bendigo (1) -- highway, not high street.
The fence keys off the REAL-ROADS signal (edges>200), NEVER shop count alone: the marched fixtures front 0
shops on their mains (bare spine, avenues carry shops) so a naive fence would have killed their v2 tram.
routeInfo{fenced,reason,shopsFronted,routeMetres} exposed for F's smoke.
BUG FOUND+FIXED: the stop projection accepted every shelter in the town with no distance gate -- harmless on
synthetic (2 shelters on the spine), nonsense on real graphs: Newtown made 149 phantom stops (~9 min of dwell
at points the tram never passes). Added a 30m gate (a shelter sits halfRoad+1.7 <=~16m off its centreline, so
genuine stops survive): newtown 149->16, castlemaine 37->10; synthetic 2 / fixtures 3 unchanged.
GROUND POLISH (ledger #4): measured, NO fix needed. Real Katoomba has 325 deg-3+ junctions, 28 under 30 deg,
worst 4.3 deg (near-parallel). At grazing eye level the worst reads clean -- no z-fight, no gaps. Layers are
already y-separated (road 0.0/foot 0.02/kerb 0.06) and road-on-road overlap is invisible by design (OVERLAP=1.5
overruns nodes on purpose; one skin, one y, one merged draw on uniform asphalt). Cosmetic only: footpath/kerb
double up on the sliver between <10deg near-parallel roads -- v4.0 candidate, not a defect.
Selector polish (ledger #5): BLOCKED -- E's towns/index.json not landed (build_towns.py WIP); REAL_TOWNS
hardcode stands, one-line swap when E lands.
-> A (finding, measured): only a slice of shops front a MAIN edge on real towns -- katoomba 7/69, fremantle
4/79, bendigo 7/35, newtown 32/64, castlemaine 11/22. The real high street classifies as 'side', which is
WHY three towns need the fence. If the main/side classifier promoted shop-dense ways to main, the fence
would lift. Note onMain also gates gigs.js pickVenues pub placement.
-> F: tram verdict above; selector gating (HUD vs ?dbg) is your call, one line either way.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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