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/config.js

@@ -42,8 +42,9 @@ export const TUNE = {
   serveHardErr: 1.6,// how much a hard serve multiplies the timing scatter: pace is paid for in
                     // faults, which is what makes tap = safe second serve a real decision
   runN: 0,          // frame-count override for run cycles (0 = probe per character sheet) — bench tuning knob
-  runHz2: 1.7,      // stride cycles/s for TWO-frame pairs (the opponents). Tuned live on the bench
-                    // with Oliver 2026-08-14 — the old hardcoded 4.5 was strobe; 1.7 reads as running.
+  runHz2: 3.4,      // stride cycles/s for TWO-frame pairs (the opponents). Tuned live on the bench
+                    // with Oliver 2026-08-14: 4.5 on six frames was strobe, 1.7 on two read as jogging,
+                    // and 3.4 with the stride-synced bob is the one he called "way better".
   runHz: 2.4,       // stride cycles/s for the rolled 6/8-frame run sets. The old hardcoded 4.5 was
                     // tuned on 2-4 near-duplicate frames; on eight real phases it strobed
   faceFlip: 0.13,   // s an auto-steered direction must persist before the body mirrors (earnFlip).