Pace was the missing dial, and the reachability test finally exists

"there are still balls which are basically not reachable with auto run..
please recheck" — and, asked twice: "did you write tests for the last issues
we encountered?" The straight answer: no. The unreachable-balls issue only
ever had config assertions, which is why it came back twice.

Pace is the ladder's fourth dial. Width alone never fixed reachability
because the returns left at ~27 m/s, crossing to the baseline in ~0.6s — less
than auto-run needs from the far corner. matchOppPace 0.78 puts opponent one
at ~20 m/s (measured live: twelve returns, 20.0-20.7), a quarter more flight
time, and matchOppPacePer hands it back per rung.

The vignette deepens: dmg x 0.8, cap 0.85, and the clean centre shrinks with
damage instead of only the rim darkening.

And the reachability regression the issue always deserved: a headless 90s
autopilot soak asserting at least 10 returns sampled and at most 15% that
never came within volley reach. Sabotage-verified. Its honest limit is
recorded in PROJECT.md: the autopilot attends perfectly and taps
frame-precisely, so it out-covers a human — it is a floor against
catastrophic regressions, not a proxy for the thumb. Oliver's playtest stays
the real gate.

46 tests, 15 seeds clean.

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

src/gameplay.js

@@ -146,6 +146,13 @@ function doHit(ch, quality, aim) {
     tz = (toFar ? tzBase : COURT.L - tzBase) + err() * 0.8;
   }
   tx = Math.max(-5, Math.min(5, tx));
+  if (G.match && ch.side !== 'P') {
+    // ...AND ITS PACE IS THE FOURTH. Width alone did not fix "unreachable" because the returns left
+    // at ~27 m/s (baseShotSpeed + 0.55 quality) — crossing to your baseline in ~0.6 s, which is less
+    // time than auto-run needs from the far corner. Opponent one gives you the flight time; the
+    // rungs take it back.
+    s *= Math.min(1, TUNE.matchOppPace + (G.match.opp - 1) * TUNE.matchOppPacePer);
+  }
   if (G.match) {
     // THE OPPONENT'S WIDTH IS THE LADDER'S THIRD DIAL. Its returns scatter off aimError x (1 - 0.55
     // quality), which paints lines an auto-run player cannot reach — "still a LOT of unreachable