The 6.8 experiment leaves its tombstone: runHz2 stays 3.4

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

src/config.js

@@ -44,7 +44,8 @@ export const TUNE = {
   runN: 0,          // frame-count override for run cycles (0 = probe per character sheet) — bench tuning knob
   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".
+                    // and 3.4 with the stride-synced bob is the one he called "way better". (6.8 was
+                    // tried and reverted on sight — the ceiling is real.)
   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).