The bob rides the stride, and the stride finds its beat: runHz2 3.4

Two live verdicts off the bench. The 1px run bob was a fixed 18 Hz wall-clock
toggle — over the calm two-frame cycle it read as independent HOPPING — so it
now shares the exact phase counter that flips the frames: one dip per step,
always in sync at any cadence. And with bob and feet locked together the
cadence itself came up for retuning: 1.7 read as a jog, doubled to 3.4 it is
a run — "that's it! way better." One knob moves both, which is what made the
doubling a one-word change.

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

src/render.js

@@ -1498,7 +1498,9 @@ function drawChar(ch) {
   //  the spot, because the run frames are a full leaning stride, not a ready-hop. He idles now.)
   if (ch.pose === 'swing') name = pre + (ch.poseT < 0.15 ? 'swing1' : 'swing2');
   if (ch.pose === 'serve') name = pre + (G.phase === 'toss' ? 'toss' : 'smash');
-  if (ch.pose === 'run') p.y -= Math.floor(ch.runT * 18) % 2; // 1px run bob
+  // the run bob rides the STRIDE, not a wall clock: one dip per step, in phase with the frame
+  // flip — the old fixed 18 Hz toggle read as independent hopping over the calm 2-frame cycle
+  if (ch.pose === 'run') p.y -= Math.floor(ch.runT * (runN >= 6 ? TUNE.runHz : TUNE.runHz2) * runN) % 2;
   const img = SPR[SK(name)];
   drawShadow(p.x, p.y, hpx * 0.22, hpx * 0.06);
   if (img) {