Splatter: clear the wave by hand, tougher 2-hit shamblers, set cards, free depth

Feedback batch from a phone playtest:

- Winning a game no longer auto-sweeps the court. The survivors stay and must
  be killed by hand (no new spawns, no scoring during the mop-up); only once the
  court is clear does play advance to the changeover / next game / set. Replaces
  sweepCourt() with a G.clearing gate + proceedAfterClear(). "CLEAR THE COURT".
- Classic shamblers (a/b) now soak one splat-quality wound before they drop
  (shamblerHp=2) — swapping to new z_aw/z_bw wound skins that bleed the thin
  dynamic trickle plus a small impact pop. Only the runner stays one-shot glass;
  brute/boss unchanged. Ball, pellets and triple side-balls all respect hp.
- Winning a SET shows a centered milestone card (a real pause) before the horde;
  one reusable drawCard() now backs both it and the reworded sudden-death card.
- Player is no longer pinned to the baseline: free to advance up-court on
  keyboard (bounded at the net); touch keeps the baseline (drag is the serve-aim)
  and the horde/GUN burst re-brace there.

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

config.js

@@ -45,6 +45,8 @@ export const TUNE = {
   fps: 60,          // frame cap — 30 halves battery/heat but Oliver felt it; smoothness wins (0 = uncapped)
   runnerSpeed: 3.2, // runner ('f') speed multiplier over the shamble
   runnerVMax: 4.2,  // hard runner speed cap — the late-game ramp must stay humanly reactable
+  shamblerHp: 2,    // splat-quality hits a classic shambler ('a'/'b') soaks before it dies — only the runner ('f') is still one-shot glass
+  setCardT: 2.0,    // s the centered SET card holds (the 'kurze unterbrechung' before the horde)
   bruteHp: 2,       // splat-quality hits (or pellets) a brute ('g') soaks before it dies
   shieldDown: 1.5,  // s a shield zombie's ('s') chair stays dropped after a block — the kill window
   meleeRange: 1.7,  // m — a racket swish cleaves shamblers this close to you