Clear the last of the "ladder" vocabulary out of the handoff and the comments

Left over from the rename: the handoff still described opponent 2 as "rung N"
and pointed at matchRung, and three comments in gameplay.js still called the
opponent curve a ladder. One word per thing, everywhere now — OPPONENTS, WOUND
STAGES, a sprite FAMILY — with a note in the handoff saying which word replaced
what, so the next reader is not left translating.

(The barrel weapons keep their own "rungs of the same ladder" line: that one is
about the WEAPON payout order and was never part of the confusion.)

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

src/gameplay.js

@@ -153,11 +153,11 @@ function doHit(ch, quality, aim) {
     // time than auto-run needs from the far corner. Opponent one gives you the flight time; the
     // rungs take it back.
     // ...and the RUNG's own pace trait rides on top, inside the cap: full pace is still the ceiling,
-    // a rung just gets there sooner or later than the flat ladder would (see matchRung in config).
+    // an opponent just gets there sooner or later than the flat curve would (see matchFoe in config).
     s *= Math.min(1, (TUNE.matchOppPace + (G.match.opp - 1) * TUNE.matchOppPacePer) * (ch.foe?.pace || 1));
   }
   if (G.match) {
-    // THE OPPONENT'S WIDTH IS THE LADDER'S THIRD DIAL. Its returns scatter off aimError x (1 - 0.55
+    // THE OPPONENT'S WIDTH IS THE 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
     // balls". Opponent one keeps its returns inside matchWideBase of the centre line; each rung
     // earns matchWidePer more width, so the line-painting is the LATE ladder, not the opening one.
@@ -1045,7 +1045,7 @@ function racketAI(rz, dt) {
   const tz = Math.max(1.5, Math.min(COURT.svcFar, ball.z)); // chase laterally, hold deep on the far court
   const dx = ball.x - rz.x, dz = tz - rz.z, d = Math.hypot(dx, dz);
   if (d > 0.15) {
-    // THE MATCH LADDER ESCALATES HERE, not in hp: with regicide gone the pool is pure scoreboard,
+    // THE MATCH ESCALATES HERE, not in hp: with regicide gone the pool is pure scoreboard,
     // so a harder opponent is a FASTER one that flubs less. The BASE is boosted too — the duel's
     // 2.8 m/s lumber was tuned for one sudden-death point against a fresh player, and across a
     // whole game it read as "very weak and slow": opponent one already moves at matchSpeedBase.