Feedback round + Phase 13: the duel, free-aim, honest stakes

Oliver's six complaints, addressed:
1. Opponent never came — a racket zombie now spawns on EVERY game you win
   (if none alive); endHorde no longer double-spawns
2. No wave-cleared feeling — sweepCourt: at game end the surviving wave
   collapses, every game gets a real beat (gameBeatT 1.6 / changeover 4.5),
   and 'GAME N' announces the next wave when play re-arms
3. Serve-posture lockup during machine gun — root cause: any 'over' beat
   expiring into setupPoint() -> pretoss during auto-fire (no movement outside
   rally, no serving during horde/GUN). The over-expiry now returns auto-fire
   modes to 'rally', never the serve loop
4. Forced bomb spending — specials commit ONLY on deliberate serves: flick
   (or arrow-aimed keyboard serve) fires the tin, plain tap keeps it; serve
   prompt teaches it ('FLICK FIRES THE BOMB - TAP KEEPS IT')
5. Auto-aim — free-aim: the flick vector maps to a landing point (length =
   depth, up to 22m), zombies within zSnap 1.4 magnet the shot, otherwise the
   ball lands exactly where flicked; taps keep the old auto-target assist;
   flicks now also work at the toss apex
6. Zombies walking through you — option (a): touch is honest. eatenR 0.9
   (brute +0.2) matches the visual sprite overlap

Phase 13 — SUDDEN DEATH interlude: court clear + un-dueled racket zombie +
about to serve -> 'Quiet, please. Play will resume.' / 'Sudden death.' One
point under REAL tennis rules (line calls live, the boss plays every ball,
spawns paused). Win (line call, double bounce, or regicide by any weapon) =
the next tin delivered on the spot; lose (out, or its return passes you) =
a game on their scoreboard + an instant 5-shambler surge. One duel per
opponent. New lines: play_resume.m4a, sudden_death.m4a.

Verified in browser: horde 'over' beat -> rally (lockup dead); game win ->
sweep + boss + beat -> SUDDEN DEATH chains naturally; duel lose path (GAME.
THEM., surge 5, scoreboard), no re-duel, fresh-boss duel, bomb regicide ->
tin on the spot; tap serve keeps stock, real touch-flick consumes + lands
at the flicked point, magnet snaps when near; eaten at 0.85m; tennis 11/12;
no console errors. PLAN.md/HANDOFF updated: plan v2 complete.

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

input.js

@@ -29,7 +29,7 @@ const DEAD = 14;
 // gameplay consumes the flick at contact; returns null if none or expired
 export function takeFlickAim(maxAgeMs = 450) {
   if (flickAim && performance.now() - flickAim.t < maxAgeMs) {
-    const aim = { ax: flickAim.ax, az: flickAim.az };
+    const aim = flickAim; // carries ax/az (lanes, tennis) AND fx/fy/mag (splatter free-aim)
     flickAim = null;
     return aim;
   }
@@ -65,7 +65,9 @@ const endTouch = e => {
     if (!stick.moved && dt < 250) keyPressed('Space');                     // tap
     else if (dt < 300 && dist > 28) {                                      // flick = aimed swing
       flickAim = { ax: Math.abs(dx) > dist * 0.38 ? Math.sign(dx) : 0,
-                   az: Math.abs(dy) > dist * 0.38 ? Math.sign(dy) : 0, t: performance.now() };
+                   az: Math.abs(dy) > dist * 0.38 ? Math.sign(dy) : 0,
+                   fx: dx / dist, fy: dy / dist, mag: dist,                // raw vector: splatter free-aim
+                   t: performance.now() };
       keyPressed('Space');
     }
     stick = null; touchAxis.x = 0; touchAxis.z = 0;