Phase 7: the scoreboard is the progression — spawn director, changeovers, sets, permadeath

- Spawn director: gap and court cap scale with games finished (runGames);
  game 1 is three lonely shamblers, late runs approach zSpawnMin/zMaxCap
- Changeover after odd games: 4.5s forced breather, no spawns, no serving
  (melee still works), boys mop, umpire calls 'Time.' (new time.m4a)
- 6 games = a set; set end launches the horde (replaces the splatGames>=2 trigger)
- Zombies taking a game sets shameGame (phase 9 withholds the delivery)
- Eaten = the run is over: GAME, SET, MASSACRE summary with games/sets survived
  and best run (localStorage); HUD shows sets in splatter (SETS·GAMES PTS)
- spentBall() helper so dead-ball paths can't clobber a changeover's beat
- T surface: splatPoint + explode exposed for verify scripts

Verified: game-1 cap 3 held 25s; changeover blocks taps+spawns then resumes;
6 games -> set+horde -> racket zombie; runGames=6 tempo ~6 spawns/10s;
eaten writes best; tennis regression 11/12 CPU returns; no console errors.

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

config.js

@@ -18,8 +18,12 @@ export const TUNE = {
   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
+  zSpawnEvery: 3.0, // s between spawns in game 1 — shrinks by zSpawnStep per finished game
+  zSpawnMin: 1.0,   // spawn-gap floor late in a run
+  zSpawnStep: 0.22, // spawn-gap reduction per finished game
+  zMax: 3,          // shamblers on court in game 1 (cap grows +1 per game to zMaxCap; 0 = spawns off, for tests)
+  zMaxCap: 14,      // absolute shambler cap
+  changeoverT: 4.5, // s the changeover breather lasts (after odd games, as the rules demand)
   zSplatQ: 0.5,     // min shot quality to splatter; below = stagger pushback
   zPushback: 1.4,   // m a staggered zombie is knocked back
   splatterOverT: 0.1, // s the spent-ball 'over' beat lasts before the next serve is armed