HARD finally outruns the runner

Oliver benchmarked HARD against the game's own roster: "the runner in zombie
mode is way faster than the regular player in hard" — and the numbers agreed.
The RUNNER covers 6.15 m/s (racketSpeed x rung x foe.speed) with no reaction
gate; HARD's classic CPU did 5.59, only after its 0.22 s read, and ambled
back to centre at HALF speed between shots — that recovery jog was the free
points. HARD now moves 4.3 x 1.5 = 6.45 m/s, and DIFFS grows `recover`: the
between-shots factor, 0.85 on HARD where the shipped 0.5 stays pinned on
MEDIUM. Wrong-footing him still works; strolling him side to side no longer
does.

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

src/gameplay.js

@@ -1733,7 +1733,9 @@ export function update(dt) {
     const incoming = ball.active && ball.lastHit === 'P'
       && G.aiReactT >= (G.diff ? G.diff.reaction : TUNE.aiReaction);
     const tgt = incoming ? intercept('O') : HOME.O;
-    const spd = TUNE.aiSpeed * (G.diff ? G.diff.speed : 1) * (incoming ? 1 : 0.5); // slow recovery: wrong-footing wins points
+    const spd = TUNE.aiSpeed * (G.diff ? G.diff.speed : 1)
+      * (incoming ? 1 : (G.diff ? G.diff.recover : 0.5)); // slow recovery: wrong-footing wins points
+
     const dx = tgt.x - O.x, dz = tgt.z - O.z, d = Math.hypot(dx, dz);
     if (d > 0.1) {
       O.x += dx / d * Math.min(spd * dt, d);