data: add fine-tuning run results (lr=3e-5, 30 epochs)

val loss 1.19 → 0.77, val perplexity 3.29 → 2.15.
Best epoch 20, early stop at epoch 30 (patience=10).
Improvement over previous lr=1e-5 run (best val ppl 2.22).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

checkpoints/finetuned.log.csv

@@ -1,51 +1,31 @@
 epoch,train_loss,val_loss,val_ppl,lr,elapsed_s
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-2,1.129786,1.168368,3.22,9.994161e-06,9.2
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-5,0.963113,0.995150,2.71,9.854709e-06,9.2
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-7,0.867560,0.927149,2.53,9.660647e-06,8.1
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-11,0.804101,0.876820,2.40,9.045085e-06,9.7
-12,0.791397,0.868702,2.38,8.847427e-06,9.2
-13,0.778087,0.860407,2.36,8.633796e-06,8.5
-14,0.771410,0.853698,2.35,8.405079e-06,10.7
-15,0.768661,0.848427,2.34,8.162227e-06,10.7
-16,0.762623,0.842908,2.32,7.906247e-06,9.4
-17,0.749388,0.837927,2.31,7.638201e-06,8.2
-18,0.745191,0.833950,2.30,7.359203e-06,9.1
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-21,0.722057,0.824505,2.28,6.468277e-06,8.4
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-40,0.690576,0.799613,2.22,1.002786e-06,8.2
-41,0.684055,0.799269,2.22,8.176493e-07,9.5
-42,0.685102,0.799062,2.22,6.498753e-07,9.3
-43,0.689241,0.798999,2.22,5.001606e-07,8.6
-44,0.689855,0.798879,2.22,3.691268e-07,8.7
-45,0.679218,0.798795,2.22,2.573178e-07,9.1
-46,0.680892,0.798748,2.22,1.651979e-07,9.1
-47,0.688506,0.798713,2.22,9.314937e-08,8.3
-48,0.684029,0.798699,2.22,4.147145e-08,9.2
-49,0.685409,0.798693,2.22,1.037863e-08,9.2
-50,0.684188,0.798692,2.22,0.000000e+00,8.1
+1,1.173289,1.190454,3.29,2.400000e-05,11.1
+2,1.031668,1.017097,2.77,2.998248e-05,9.3
+3,0.900459,0.914644,2.50,2.990471e-05,8.2
+4,0.826531,0.877679,2.41,2.976507e-05,9.1
+5,0.797045,0.851717,2.34,2.956413e-05,9.2
+6,0.759114,0.836767,2.31,2.930272e-05,8.7
+7,0.736987,0.819369,2.27,2.898194e-05,8.6
+8,0.722803,0.806593,2.24,2.860312e-05,9.1
+9,0.693306,0.797257,2.22,2.816782e-05,9.1
+10,0.683278,0.792332,2.21,2.767785e-05,8.2
+11,0.673061,0.787863,2.20,2.713525e-05,9.1
+12,0.655914,0.782984,2.19,2.654228e-05,9.1
+13,0.643172,0.777573,2.18,2.590139e-05,8.3
+14,0.635985,0.774572,2.17,2.521524e-05,9.0
+15,0.630730,0.773065,2.17,2.448668e-05,9.1
+16,0.622494,0.771514,2.16,2.371874e-05,9.0
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