Post-fix re-measure of my R18 finding against A's committed connectivity pass
(6fc4b40). Same harness, same seed.
VERDICT: fragmentation fully resolved, sim untouched. Real Katoomba:
components 105 -> 1, street-metres in main 58.2% -> 100%, shops stranded 2 -> 0
(1 bridged, 1 dropped past SEAT_MAX AND counted in norm.dropped), % near-crowd on
fragments ~10% -> 0%. selfcheck 51670/51670 green, katoomba golden pinned.
Mechanism check: re-ran R18's dead-straight-through-junction geometry — R18 dropped
the junction (deg 2, disconnected); R19 protects it (deg-4 crossroads, 1 component).
DP-collinear drop fixed at the source.
Sim confirm on the fixed bridged graph: 0 NaN over 1,303,200 samples, footpath-perfect,
loiter/bench-sit fire, patronage rose 24->41 (peds reach shops across the connected
graph), 0 fragment-stranded peds. Zero sim changes, as R18 predicted.
D->F: fragmentation verdict post-fix is GREEN — tag away. FYI B/F: edges rose 799->966
(junction protection + bridges), flagged for the tris budget.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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