Let the ball machine roll, dent, and blow up

It was furniture in the most literal sense: bolted to one spot, three hits from
scrap, and when it died it bled and a ball boy came out to mop it.

- It trundles to a new spot every seven seconds or so, and CANNOT fire while it
  rolls. That is honest (a rolling cart cannot aim) and it is the window you use
  to close on it — but it also means it stops being a landmark you can ignore.
- Six hits, not three, and it wears them: dented at two thirds, split open and
  sparking at one third, smoking where it stands once it is that far gone.
- It comes apart as MACHINERY. No blood decal, no gore mound, no mop boy — a
  flash, sparks, torn metal and a column of dark smoke over a scorch mark. Smoke
  is a new particle flavour that rises and spreads instead of falling.

Damaged sheets keep the healthy cart's footprint: the generator drew the smoke
plume into the sprite, which would have shrunk the cart as it took damage, so
the plume is cropped off and the smoke is drawn procedurally where it can move.

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

config.js

@@ -62,7 +62,12 @@ export const TUNE = {
   // deal with, which is the target-priority decision the game was missing.
   machEvery: 4,     // games before the first machine can appear, and games between them after
   machMax: 2,       // machines allowed on court at once
-  machHp: 3,        // splat-quality hits to wreck one
+  machHp: 6,        // splat-quality hits to wreck one. It is a steel cart, not a body — and it now
+                    // shows the damage on the way down (z_machw1 dented, z_machw2 split open)
+  machRoll: 1.6,    // m/s it trundles when it repositions. It CANNOT fire while rolling, which is
+                    // both honest (a rolling cart cannot aim) and the window you use to close on it
+  machRepo: 7,      // s between repositions, jittered. "Furniture that occasionally wheels itself
+                    // somewhere else" — it stops being a landmark you can ignore once it is aimed away
   machCycle: 3.4,   // s between its shots
   machWind: 0.9,    // s of TELEGRAPH before each shot — the fairness contract, same idea as shriek()
   machSpeed: 13,    // m/s it fires at