Phase 2: multi-kill applause + umpire appreciation

A single shot that splatters ≥2 zombies now escalates: DOUBLE KILL /
TRIPLE KILL / MASSACRE ×N flash, louder crowd, and a new umpire line
(double_kill / triple_kill / unbelievable m4a, recorded say -v Daniel).
ball.kills tracks the streak, reset on every fresh shot (doHit + hitServe).
zombies.js imports cheer (now exported from gameplay). The splatter pace
cut is now TUNE.zPierce (0.75, was hardcoded 0.5) so a hot ball plows
through a lined-up lane instead of stalling on the first kill.

Verified via window.T: a low ball down a one-side lane kills 3→TRIPLE and
5→MASSACRE ×5 with escalating flash, streak resets on the next serve, the
three new lines serve 200 and match the existing m4a format, no crash when
the ball dies mid-streak, no console errors.

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

zombies.js

@@ -6,7 +6,7 @@
 import { TUNE, COURT } from './config.js';
 import { G, P, ball, sendBoy } from './state.js';
 import { splat, moan, pock, voice } from './audio.js';
-import { splatPoint } from './gameplay.js';
+import { splatPoint, cheer } from './gameplay.js';
 
 export const zombies = []; // {x, z, v, walkT, variant: 'a'|'b'|'c'}
 export const gore = [];    // lawn decals {x, z, r, a}
@@ -22,6 +22,7 @@ export function spawnZombie(x, z, variant) {
 function splatter(i) {
   const zb = zombies[i];
   zombies.splice(i, 1);
+  ball.kills++;                   // this shot's running streak
   gore.push({ x: zb.x, z: zb.z, r: 0.45 + Math.random() * 0.35, a: 0.85 });
   if (gore.length > 40) gore.shift();
   for (let k = 0; k < 14; k++) parts.push({
@@ -30,9 +31,13 @@ function splatter(i) {
     t: 0.4 + Math.random() * 0.4,
   });
   splat();
-  ball.vx *= 0.5; ball.vz *= 0.5; // the kill takes pace off the ball
+  ball.vx *= TUNE.zPierce; ball.vz *= TUNE.zPierce; // keep enough pace to plow through the next
   sendBoy(zb.x, zb.z);            // a boy sprints out to mop
   splatPoint('P');
+  // escalating multi-kill fanfare — one shot, ≥2 zombies
+  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); }
 }
 
 export function updateZombies(dt) {