Zombie town: the match continues

Win your first game and the applause cuts off mid-clap. The palette drains,
the umpire lowers his voice ('Quiet... please'), your opponent turns — torn
red polo, dragging his racket — and shamblers come over the billboard wall.
The scoreboard rewrites CPU to THEM. 'Play.'

- zombies.js: shamblers walk your way; quality shots splatter them (gore
  decal + particle burst + wet synth splat), weak sitters only stagger them
  back; one crossing your baseline is a point for THEM
- tennis scoring machinery keeps running untouched: fifteen, thirty, deuce,
  and 'Game, set... massacre' on a game win, all in recorded umpire English
- ball boys mop the gore they pass (their destiny fulfilled)
- transition: palette lerp, scripted spawns incl. the turned opponent,
  new recorded lines (quiet_dark, remain_seated, play, new_balls)
- moan ambience, drained splatter palette, all zombie params in TUNE

Verified: transition triggers on first game win, splat/stagger/baseline
scoring all correct, dead-ball flow feeds fresh serves, tennis mode
regression clean (6/6 returns, 6/6 points resolved).

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

config.js

@@ -17,6 +17,11 @@ export const TUNE = {
   aiQualityMin: 0.45, aiQualityMax: 0.85, aiFlub: 0.09,
   aiReaction: 0.45,        // s before the CPU reads your shot — well-aimed corners are winners
   autoAssist: matchMedia('(pointer: coarse)').matches ? 1.15 : 0, // auto-run speed factor (mobile)
+  zSpeed: 0.7,      // zombie shamble speed m/s
+  zSpawnEvery: 2.6, // s between spawns
+  zMax: 6,          // shamblers on court at once
+  zSplatQ: 0.5,     // min shot quality to splatter; below = stagger pushback
+  zPushback: 1.4,   // m a staggered zombie is knocked back
 };
 
 export const COURT = { L: 23.77, W: 8.23, dblW: 10.97, netZ: 11.885, netH: 0.914, netW: 10.06 };