KB: mark authentic per-mech turn-rate DONE (task #64b)

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

context/open-questions.md

@@ -420,7 +420,12 @@ register.  ⚠ The audit also flags the damage-economy item as SELF-CONTRADICTOR
   - FOLLOW-UP (non-blocking): if the copy bit ever gets set at construction for other reasons,
     the ctor gate already handles it and MaintainViewClipSet becomes a no-op agreement — no
     conflict, but revisit whether the per-frame maintenance is still needed.
-- Authentic per-mech TURN-RATE constant (currently a bring-up constant rate).
+- ✅ **Authentic per-mech TURN-RATE — DONE (task #64b, 2026-07-14) [T1/T2].** The master-perf
+  disasm (0x4aa3d3-0x4aa4ff) turn-rate lerp (walkingTurnRate@0x574 → runningTurnRate@0x578 by
+  ground speed, run-speed refinement) is wired into the drive, replacing the `kDriveTurnRate`
+  bring-up constant; the rates (which the `Wword(0x15d/0x15e)` no-op was discarding) are real
+  members now. Also the trn-in-place DISPATCHER (entry/exit) reconstructed from the same disasm,
+  replacing the task-#64 `0.25×`/fast-forward stand-ins. See [[locomotion]].
 - Body-callback gimp handlers (states 16-19, targets 0x70b2/0x7161 undecoded → fall back to stand);
   airborne callbacks (`FUN_004a6344`/`FUN_004a7970`).
 - Wall-block-vs-climb tuning. **✅ Collision DAMAGE application — DONE 2026-07-08 [T2].** The two deferred