Phase 4: bomb balls

Ball boys deliver a bomb ball every TUNE.bombEvery (8) splatter kills, up
to TUNE.bombMax (3) in stock (G.bombs / G.killMeter in state). The next
serve auto-consumes one (hitServe, splatter-only) — no extra input, keeping
one-handed play. A bomb detonates on first zombie contact (regardless of
pace) or, if it misses everyone, on its first bounce: explode() splatters
everything within TUNE.bombRadius (2.5m), each kill feeding ball.kills so
the Phase-2 fanfare escalates naturally, and leaves a crater — big stain,
size-3 pile, 40 particles, 0.1s hitstop, boom(). New synth boom() in
audio.js. Bomb ball renders black with a flickering orange fuse; the HUD
shows stocked bombs as black/orange pips by the YOU line. Both explode
sites set phase='over' so the serve loop doesn't stall on the killed ball.

Alternative delivery ideas Oliver floated but not built: umpire throws it,
or court pickup.

Verified via window.T: 8th kill earns a bomb (meter resets); a serve
consumes one and renders #111 black + orange fuse; a pow-0 bomb amid 4
clustered zombies kills all 4 with 'MASSACRE ×4', boom, hitstop 0.1,
crater stain (r1.4) + size-4 pile; a bomb that misses still craters on
first bounce; bombs never leak into tennis (mode guard); 3 HUD pips; no
console errors.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

zombies.js

@@ -5,7 +5,7 @@
 
 import { TUNE, COURT } from './config.js';
 import { G, P, ball, sendBoy } from './state.js';
-import { splat, moan, pock, voice } from './audio.js';
+import { splat, moan, pock, voice, boom } from './audio.js';
 import { splatPoint, cheer } from './gameplay.js';
 
 export const zombies = []; // {x, z, v, walkT, variant: 'a'|'b'|'c'}
@@ -43,6 +43,27 @@ function splatter(i) {
   if (ball.kills === 2) { G.flash = { text: 'DOUBLE KILL', t: 0.9 }; cheer(1.6, 0.45); voice('double_kill', 0.4); }
   else if (ball.kills === 3) { G.flash = { text: 'TRIPLE KILL', t: 0.9 }; cheer(2.2, 0.6); voice('triple_kill', 0.4); }
   else if (ball.kills >= 4) { G.flash = { text: `MASSACRE ×${ball.kills}`, t: 0.9 }; cheer(2.8, 0.7); voice('unbelievable', 0.4); }
+  // bomb-ball reward: every bombEvery kills a boy delivers one (up to bombMax in stock)
+  if (++G.killMeter >= TUNE.bombEvery) {
+    G.killMeter = 0;
+    if (G.bombs < TUNE.bombMax) { G.bombs++; sendBoy(); voice('new_balls', 0.2); G.flash = { text: 'BOMB BALL', t: 0.9 }; }
+  }
+}
+
+// bomb ball: everything inside bombRadius splatters at once (each kill still ++ball.kills so
+// the Phase-2 fanfare escalates), plus a crater — big stain, size-3 pile, extra particles, boom.
+export function explode(x, z) {
+  for (let i = zombies.length - 1; i >= 0; i--) // backwards: splatter() splices the array
+    if (Math.hypot(zombies[i].x - x, zombies[i].z - z) < TUNE.bombRadius) splatter(i);
+  gore.push({ x, z, r: 1.4, a: 0.9 }); if (gore.length > 40) gore.shift();
+  const pl = piles.find(p => Math.hypot(p.x - x, p.z - z) < 0.6);
+  if (pl) pl.size = Math.min(4, pl.size + 3);
+  else { piles.push({ x, z, size: 3, seed: Math.random() * 1e4, blobs: null, builtSize: 0 }); if (piles.length > 30) piles.shift(); }
+  for (let k = 0; k < 40; k++) parts.push({
+    x, y: 0.6, z, vx: (Math.random() * 2 - 1) * 6, vy: 1 + Math.random() * 5, vz: (Math.random() * 2 - 1) * 6,
+    t: 0.5 + Math.random() * 0.7, dark: k % 2 === 0,
+  });
+  G.hitstop = 0.1; boom();
 }
 
 export function updateZombies(dt) {
@@ -77,6 +98,10 @@ export function updateZombies(dt) {
     if (ball.active && ball.lastHit === 'P' && ball.y < 1.9) {
       const d = Math.hypot(ball.x - zb.x, ball.z - zb.z);
       if (d < 0.55) {
+        if (ball.bomb) { // detonate on first contact, whatever the pace
+          explode(ball.x, ball.z); ball.active = false; ball.bomb = false;
+          G.phase = 'over'; G.overT = TUNE.splatterOverT; break; // zombies mutated — stop this frame's loop
+        }
         if ((ball.pow || 0) >= TUNE.zSplatQ) { splatter(i); continue; }
         zb.z -= TUNE.zPushback; // weak sitters only stagger them
         pock(0.6, 300);