feat: v0.14.0 — ISS-006 time-scale slider values up to 1000x; tests use fastest time

lib/timeScale.ts

@@ -1,24 +1,33 @@
-// Pure mapping helpers for the time-scale slider (v0.9.2) — no game logic, unit-testable
-// in node. The slider has 7 discrete positions on a power-of-two ladder:
-// 1× → 2× → 4× → 8× → 16× → 32× → 64×, so each step doubles the speed (matching
-// POST /api/sim's clamp range [1, 64]).
+// Pure mapping helpers for the time-scale slider (v0.9.2, values reworked in v0.14.0) — no
+// game logic, unit-testable in node. The slider has 10 discrete positions on a mixed
+// ×2/×2.5 ladder: 1× → 2× → 5× → 10× → 25× → 50× → 100× → 250× → 500× → 1000×, so each
+// step roughly doubles the speed (matching POST /api/sim's clamp range [1, 1000]).
 
-export const TIME_SCALES = [1, 2, 4, 8, 16, 32, 64] as const;
+export const TIME_SCALES = [1, 2, 5, 10, 25, 50, 100, 250, 500, 1000] as const;
 export const MIN_SCALE: number = TIME_SCALES[0];
 export const MAX_SCALE: number = TIME_SCALES[TIME_SCALES.length - 1];
 
 const clamp = (v: number, lo: number, hi: number) => Math.min(hi, Math.max(lo, v));
 
 // t → scale: the position maps to the nearest ladder step. Exact at the endpoints:
-// sliderToScale(0) === 1, sliderToScale(1) === 64.
+// sliderToScale(0) === 1, sliderToScale(1) === 1000.
 export function sliderToScale(t: number): number {
   const tt = clamp(Number.isFinite(t) ? t : 0, 0, 1);
   return TIME_SCALES[clamp(Math.round(tt * (TIME_SCALES.length - 1)), 0, TIME_SCALES.length - 1)];
 }
 
-// scale → t: the nearest ladder position by log2 distance. Exact at the endpoints:
-// scaleToSlider(1) === 0, scaleToSlider(64) === 1; round-trips every value in TIME_SCALES.
+// scale → t: the nearest ladder position by log distance. Exact at the endpoints:
+// scaleToSlider(1) === 0, scaleToSlider(1000) === 1; round-trips every value in TIME_SCALES.
 export function scaleToSlider(scale: number): number {
   const s = clamp(Number.isFinite(scale) ? scale : MIN_SCALE, MIN_SCALE, MAX_SCALE);
-  return Math.log2(s) / Math.log2(MAX_SCALE);
+  let best = 0;
+  let bestDist = Infinity;
+  for (let i = 0; i < TIME_SCALES.length; i++) {
+    const d = Math.abs(Math.log(s) - Math.log(TIME_SCALES[i]));
+    if (d < bestDist) {
+      bestDist = d;
+      best = i;
+    }
+  }
+  return best / (TIME_SCALES.length - 1);
 }