Gate 3.2: bike_kid_01_v1 on backyard_01's south fence, rotYDeg 180 so the
baked -Z lean lands ON the fence — bars measured to the rail (0.286 m
reach, z 9.69 -> grip at 9.98), tyres 0.31 m clear, between posts. Unpriced
by ruling: the sim can't knock a bike over, and billing an unseen event is
the lie the invoice kills; the windward-fence pose is the honest one.
a.test pins lean direction, standoff band, and the ruling. 318/0/0.