Splatter feel pass: baseline turret, tennis duel, rapid serves, bleeding wounds

- Stand at the baseline: in splatter the player is pinned to the baseline
  (a turret, side-to-side only) — the duel is exempt so it keeps free depth.
- Zombie 1:1 duel now plays like real tennis: no free-aim flick, no drag
  reticle; lane aim + the toss-then-hit serve (gate on !G.interlude in
  doHit/hitServe/keyPressed/canAimServe).
- Rapid serves: the two-stage reticle serve now fires mid-rally too — a ball
  still in flight is banished to a ballistic clone so the next serve launches
  at once. Serve as fast as you can drag-release.
- Wounded skins for multi-hit foes: brute (arm off) and racket boss (arm off,
  then headless) swap by remaining hp, with a graceful fallback to the healthy
  sprite. The headless boss is drawn a head shorter so the shoulders line up.
- Dynamic gore: the blood is NOT painted in — open wounds gush live particles
  every frame (arm stumps + a neck geyser on the headless boss), absurdly, and
  bounded so it self-regulates.

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

input.js

@@ -42,8 +42,9 @@ export function takeFlickAim(maxAgeMs = 450) {
 // the two-stage serve: a drag that STARTS at a serveable pretoss aims a visible reticle
 // (G.aim, drawn by render); release fires the serve there, dragging back home cancels.
 const canAimServe = () =>
-  G.mode === 'splatter' && G.phase === 'pretoss' && score.server === 'P' && G.weapon !== 4 // GUN pops on tap, no reticle
-  && !G.horde && !(G.mgT > 0) && !G.changeover && !(G.interlude && G.interlude.introT > 0);
+  G.mode === 'splatter' && (G.phase === 'pretoss' || G.phase === 'rally') // rally too: rapid serves mid-flight
+  && score.server === 'P' && G.weapon !== 4 // GUN pops on tap, no reticle
+  && !G.interlude && !G.horde && !(G.mgT > 0) && !G.changeover; // the duel serves like tennis: no reticle
 
 let steerPX = null; // live absolute finger x (-1..1 across the canvas) — machine-gun steering reads it
 export const touchPX = () => steerPX;