Audited the citizen sim on real irregular street topology. E landed katoomba_real's
real roads (484 ways -> 872 nodes/799 edges) mid-round, so this is measured on the
real Katoomba graph plus a crafted irregular proxy.
VERDICT: the CityPlan graph contract IS the contract — zero sim changes. On real
Katoomba (7.2deg junctions, 1303m edge, 105 components): 0 NaN over 1,095,500 samples,
peds footpath-perfect (0 off-footpath), loiter/bench-sit/patronage all fire, chunk
streaming works over non-grid, determinism byte-identical (1167 identity sigs, R14
chunk-local law holds). No source touched.
FILED FOR A: katoomba_real's graph is 105 components — main holds 58% of street-metres
+ 18/20 shops, but 42% of street-metres + 2 shops strand (~10% of near-main crowd
presence lands on tiny fragments). Primary cause is expected: median fragment 71.5m
from main = peripheral/bbox-clipped roads. Secondary (corroborated with Lane B on A's
selfcheck fixture): per-way Douglas-Peucker drops collinear junction points + no
mid-edge split — bites only the 9/85 fragments <10m from main. Reconciles with B:
B verified 126 intersections form (main component); I add the global measurement
(still 105 components). A fidelity knob (charter risk #4), not a blocker; sim degrades
gracefully (no crash). A owns the connect-tolerance decision.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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