Phase 8: bomb juice — the explosion is finally FELT

- Camera shake (G.shake, decays over 0.35s; HUD stays steady via transform reset)
- One white flash frame (G.boomFlash overlay)
- Scorch crater: near-black stain the boys mop 10x slower — the lawn scars
- Hitstop 0.1 -> 0.18
- Umpire loses composure: 'Order. Order, please.' (new order.m4a), rate-limited
  so bomb chains don't spam him

Verified: explode kills cluster of 4 (MASSACRE x4 chains), shake/flash set and
decay clean, 2nd bomb order-call suppressed, 1s of mopping erases blood (0.9->0)
but not the crater (1->0.84); screenshot mid-shake; no console errors.

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

gameplay.js

@@ -467,6 +467,8 @@ export function update(dt) {
     return;
   }
   if (G.flash) { G.flash.t -= dt; if (G.flash.t <= 0) G.flash = null; }
+  if (G.shake && (G.shake.t -= dt) <= 0) G.shake = null;
+  if (G.boomFlash > 0) G.boomFlash -= dt;
   crowd.cheer = Math.max(0, crowd.cheer - dt);
   G.idleT += dt;
   const w = BOUNCE_IDLE.tempo;