[khiet]

Summary

Spoon's exit becomes a choice: the left half flies off a boosted ramp, the right half stays on the ground for the tow. Closes #330.

 Layout
   elevation: [bridge_hill]          # lifts the whole road, walls included
-    Ramp(s, s + 12, 1.5)
+  ramps: [Ramp(s, s + 8, 0.5, right=0, left=6)]   # a slope on part of the asphalt
   boost_pads:
+    BoostPad(ramp foot - 2, offset=3)             # same half, into the foot

 build
   Asphalt
+    ramp_in_the_asphalt             # slope shares the road's vertices at the foot
   Scenery
+    ramp_markings                   # kerb stripes, striped sides, white lip

Three things differ from a plain reading of the issue, each measured through step and recorded in ADR 0101:

• Lower and later ramp. It goes from 1.5 x 12 m to 0.5 x 8 m, and from 14 m to 36 m along back-straight. A pad's 1 s boost ends in flight off a higher ramp, and the old lip's next checkpoint was closer than any landing. Airtime is about 0.4 s, not much more than a hop's 0.3 s.
• Slope only, in the Asphalt mesh. A separate wedge threw karts at up to 17 m/s, side and lip faces stopped karts dead on the flat half, and road under the slope killed the launch.
• Bots keep their line. That line is on the flat half, and traffic still puts some on the ramp. Choosing it on purpose is card X5.

Evidence

• Before: the whole road jumps; every kart leaves the ground.
  After:

kart 3 m left of centre   off the lip at 962 m, 42 m/s; lands 979 m, 0.4 s later, 0.2 s boost left
kart 3 m right of centre  never airborne, no boost
bots, 40 seeds x 3 levels  0 of 960 unfinished; 200-race stuck sweep clean

cargo nextest run   573 passed, 8 skipped
pnpm test           1137 passed
pnpm test:tracks    OK
replays             new bell-deer-ramp-launch fixture; native and wasm agree

Screenshots:

Pad and ramp ahead, from its half	On the slope, boosted

The ramp ahead, from the flat half	Passing its side on the flat half

Merge Danger

Door: two-way

Layout, sidecar and replays revert together.

Blast Radius: Bell Deer

Every Bell Deer race changes. A kart cutting under the slope's last 1.6 m reads grass for a few ticks and drops to the off-track cap. Projectiles ride the centreline's height, so they pass through the slope's drawing. Other courses' exports are byte-identical.