Stop the dead for the changeover instead of letting the player wander

Oliver vetoed the free movement between points on sight: he never walks
freely during play, so being able to only between points reads as the game
breaking, not as a fix. Reverted to 'rally' only, and the rule is written into
the settled-feel list so it doesn't get re-invented.

The frozen changeover is answered his other way instead — the dead wait too.
`held` in updateZombies stops their advance, their steering and the eat check
for the breather; they still bleed and burn, they just stand there, because
the umpire called time and it is still a tennis match. The path where this
actually bit: losing a duel scheduled on a changeover beat spawns five fresh
shamblers and THEN starts five seconds you have no agency in.

The stuck pose was never about movement — 'run' is the one pose expirePose
doesn't expire, and runT stops advancing outside the block, so a beat that
began mid-stride welded him to a single frame. Reset it and it's fixed for
every phase.

And he could walk off the screen in ordinary play, not just during the beat I
had added: P_BOUNDS.x is 6.5 m, portrait shows about ±4 m at the baseline.
The xVis clamp already existed but only applied during auto-fire; it now
always applies, floored at the sideline so every legal ball stays catchable.

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

zombies.js

@@ -269,23 +269,30 @@ export function updateZombies(dt) {
   // the only bodies left to catch were the ones it had already removed.
   if (ball.active && ball.flame && ball.y < 2.6) ignite(ball.x, ball.z, TUNE.burnBallR);
 
+  // The umpire called time. The changeover is a MANDATORY breather for the player — no serving, no
+  // walking — so it is one for the dead too, which is the joke: they wait, because it's still a
+  // tennis match. They stand where they are, still bleeding, still burning, still lit by anything
+  // in the air, but nothing advances and nothing can eat you. (The alternative — letting the player
+  // walk freely during the beat — was tried and vetoed: he never walks freely during play either.)
+  const held = !!G.changeover;
+
   for (let i = zombies.length - 1; i >= 0; i--) {
     const zb = zombies[i];
     if (!zb) continue; // a bomb detonation splices several out mid-loop and can gut the array under us
     zb.walkT += dt;
     if (zb.burnT > 0 && burnTick(zb, i, dt)) continue; // the fire finished it — the array moved under us
-    zb.z += zb.v * (zb.burnT > 0 ? TUNE.burnPanic : 1) * dt;
+    if (!held) zb.z += zb.v * (zb.burnT > 0 ? TUNE.burnPanic : 1) * dt;
     bleed(zb); // open wounds bleed every frame they're standing
 
     if (zb.shieldT > 0) zb.shieldT -= dt; // staggered chair comes back up when this runs out
-    if (zb.variant === 'r') { /* the racket boss holds station — its AI owns its x */ }
+    if (held || zb.variant === 'r') { /* the racket boss holds station — its AI owns its x */ }
     else if (G.mode === 'splatter' && zb.z > COURT.netZ) { // on YOUR half they close in — each on its own lane, not a column
       const tx = P.x + zb.homeOff;
       zb.x += Math.sign(tx - zb.x) * Math.min(Math.abs(tx - zb.x), zb.v * 0.7 * dt)
             + Math.sin(zb.walkT * 2.3) * 0.25 * dt; // shamble wobble — the approach reads organic, not tracked
     } else
       zb.x += Math.sin(zb.walkT * 1.7) * 0.15 * dt; // far half: aimless shamble
-    if (G.mode === 'splatter' && Math.hypot(zb.x - P.x, (zb.z - P.z) * 0.75) < TUNE.eatenR + (zb.variant === 'g' ? 0.2 : 0)) { // z weighted down: depth is foreshortened, so a head-on shambler eats you when it LOOKS on top of you
+    if (!held && G.mode === 'splatter' && Math.hypot(zb.x - P.x, (zb.z - P.z) * 0.75) < TUNE.eatenR + (zb.variant === 'g' ? 0.2 : 0)) { // z weighted down: depth is foreshortened, so a head-on shambler eats you when it LOOKS on top of you
       gore.push({ x: P.x, z: P.z, r: 0.9, a: 0.9 });
       for (let k = 0; k < 30; k++) parts.push({
         x: P.x, y: 1.1, z: P.z,