chore: update gemini thinking percent to rate

data/u_math_eval_results.json

@@ -8,34 +8,34 @@
       55.0
     ],
     "multivariable_calculus": [
-      74.16,
-      74.0,
-      75.0
+      0.7416,
+      0.74,
+      0.75
     ],
     "integral_calc": [
-      55.29,
-      54.67,
-      56.9
+      0.5529,
+      0.5467,
+      0.569
     ],
     "sequences_series": [
-      78.57,
-      80.0,
-      25.0
+      0.7857,
+      0.800,
+      0.250
     ],
     "differential_calc": [
-      62.27,
-      69.33,
-      47.14
+      0.6227,
+      0.6933,
+      0.4714
     ],
     "algebra": [
-      87.22,
-      93.33,
-      56.67
+      0.8722,
+      0.9333,
+      0.5667
     ],
     "precalculus_review": [
-      92.5,
-      95.33,
-      50.0
+      0.925,
+      0.9533,
+      0.500
     ]
   },
   {