Take the cone down and turn it blue

Lower alpha through the whole fill (0.34 -> 0.19 at the strings, falling with
depth) and the core is a LIT BLUE rather than near-white, which is what was
washing it out. The stroked edges come down and turn blue with it.

Worth recording, because it will come up again: the cone's opacity and how well
you can tell above-the-plane from below-the-plane are the same dial. The plane is
flat -- a body above it is drawn clean on top, a body below is seen through it --
so the distinction just IS the cone's alpha. Fainter cone and sharper split pull
against each other; the fainter cone wins and the cut line carries the signal.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

HANDOFF.md

@@ -443,6 +443,11 @@ that holds that height all the way out instead of sloping to the ground — that
 makes the rest possible. Sloping, it lay flat on the grass across the whole far half, so there was
 nothing for it to cut exactly where the crowd stands.
 
+- **The cone's opacity and the over/under read are the SAME dial, and they pull against each other.**
+  The plane is flat: a body above it is drawn clean on top, a body below is seen THROUGH it — so how
+  clearly you can tell the two apart just is how opaque the cone is. Oliver asked for a fainter,
+  bluer cone AND a clearer split; the first wins, and the CUT LINE carries the signal instead. Do not
+  try to "fix" the split by raising the cone alpha again — that is the thing he asked to come down.
 - **The fill is TWO gradients**, matching the reference Oliver sent: a horizontal one across the
   width (near-white down the centre line, falling to the weapon's blue at the edges) and a depth one
   along the length. Canvas has no 2D gradient, so the wedge is filled in eight slices along its