Make the double tap a stance that holds the net

Oliver on v376: "wenn man doppeltippt, geht er minimal vor". His own
ball's flight covered 4-9 m of the 10 to the net. His next ball was met
from mid-court, outside the net zone, and the recovery after that volley
walked him straight back to the baseline.

The double tap now sets a stance (P.post) that lasts until the next
double tap, a lob he has to run down, or the end of the point. Every
recovery heads for the net at full pace, and every incoming ball is
planned as a net man's. The 'back' stance clears once he is behind the
net zone, so short balls still pull him in.

Measured: contacts while committed are ~35% at the net and ~40% around
the service line, and he no longer falls back. The base ladder is
unchanged. New test; v377.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

test.js

@@ -1573,6 +1573,30 @@ test('THE DOUBLE TAP at the net is the way back; a long down-flick is only the l
   assert.ok(back.fromNet > TUNE.netFrom, `...and he is back behind the net zone: ${back.fromNet.toFixed(1)} m`);
 });
 
+test('THE DOUBLE TAP is a STANCE: a volley from mid-court keeps him coming in, not walking back', () => {
+  // Oliver on v376: "wenn man doppeltippt, geht er minimal vor". His own ball's flight covers 4-9 m of the 10,
+  // his next ball was met from mid-court — outside the net zone — and the recovery after it took him straight
+  // back to the baseline. P.post holds the net until the next double tap, a lob he runs down, or the point.
+  const assist = TUNE.autoAssist; TUNE.autoAssist = 1.15;
+  const after = post => {
+    freshSplatter(); startMatch(); G.interlude.introT = 0;
+    const rz = oppOf(); Object.assign(rz, { x: 3, z: -0.6, swingCool: 999, swingT: -1 });
+    G.phase = 'rally'; G.wasServe = false;
+    Object.assign(P, { x: 0, z: COURT.netZ + 9, swingT: -1 });  // his volley was struck 9 m out
+    P.post = post;
+    const v = solveShot(0, 1, P.z - 0.4, 1, 3, 18);
+    Object.assign(ball, { active: true, scored: false, lastHit: 'P', bounces: 0, rx: null, spin: 1, soft: false,
+      approach: null, retreat: null, x: 0, y: 1, z: P.z - 0.4, vx: v.vx, vy: v.vy, vz: v.vz, g: TUNE.gravity });
+    for (let i = 0; i < 60 && ball.active; i++) { rz.swingCool = 999; update(DT); }
+    return Math.abs(P.z - COURT.netZ);
+  };
+  try {
+    const committed = after('net'), loose = after(null);
+    assert.ok(committed < TUNE.netFrom, `committed to the net, he keeps coming in: ${committed.toFixed(1)} m`);
+    assert.ok(loose > 9, `without the stance the old recovery still walks him back: ${loose.toFixed(1)} m`);
+  } finally { TUNE.autoAssist = assist; }
+});
+
 test('an INCOMING ball keeps every tap a swing: the double tap never eats a shot', () => {
   freshSplatter(); startMatch(); G.interlude.introT = 0;
   oppOf().swingCool = 999;