feat: add metadata files for NNUE weights versions and implement burst training functionality with subsampling options

modules/bot/python/weights/nnue_weights_v4_metadata.json

@@ -0,0 +1,13 @@
+{
+  "version": 4,
+  "date": "2026-04-09T00:28:07.572209",
+  "num_positions": 2009355,
+  "stockfish_depth": 12,
+  "epochs": 40,
+  "batch_size": 4096,
+  "learning_rate": 0.001,
+  "final_val_loss": 9.106677896235248e-05,
+  "device": "cuda",
+  "checkpoint": "/mnt/d/Workspaces/NowChessSystems/modules/bot/python/weights/nnue_weights_v3.pt",
+  "notes": "Win rate vs classical eval: TBD (requires benchmark games)"
+}

modules/bot/python/weights/nnue_weights_v5_metadata.json

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+{
+  "version": 5,
+  "date": "2026-04-09T18:50:27.845632",
+  "num_positions": 2009355,
+  "stockfish_depth": 12,
+  "epochs": 100,
+  "batch_size": 16384,
+  "learning_rate": 0.001,
+  "final_val_loss": 9.180421525105905e-05,
+  "device": "cuda",
+  "checkpoint": null,
+  "notes": "Win rate vs classical eval: TBD (requires benchmark games)"
+}

modules/bot/python/weights/nnue_weights_v6_metadata.json

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+{
+  "version": 6,
+  "date": "2026-04-09T21:28:21.000832",
+  "num_positions": 1958728,
+  "stockfish_depth": 12,
+  "epochs": 100,
+  "batch_size": 16384,
+  "learning_rate": 0.001,
+  "final_val_loss": 0.2984530149085532,
+  "device": "cuda",
+  "checkpoint": "/home/janis/Workspaces/NowChessSystems/modules/bot/python/weights/nnue_weights_v5.pt",
+  "notes": "Win rate vs classical eval: TBD (requires benchmark games)"
+}

modules/bot/python/weights/nnue_weights_v7_metadata.json

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+{
+  "version": 7,
+  "date": "2026-04-09T22:06:50.439858",
+  "num_positions": 1958728,
+  "stockfish_depth": 12,
+  "epochs": 100,
+  "batch_size": 16384,
+  "learning_rate": 0.001,
+  "final_val_loss": 0.2997283308762831,
+  "device": "cuda",
+  "checkpoint": null,
+  "notes": "Win rate vs classical eval: TBD (requires benchmark games)"
+}

modules/bot/python/weights/nnue_weights_v8_metadata.json

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+{
+  "version": 8,
+  "date": "2026-04-09T22:22:47.859730",
+  "num_positions": 1958728,
+  "stockfish_depth": 12,
+  "epochs": 100,
+  "batch_size": 16384,
+  "learning_rate": 0.001,
+  "final_val_loss": 0.24803777390839968,
+  "device": "cuda",
+  "checkpoint": "/home/janis/Workspaces/NowChessSystems/modules/bot/python/weights/nnue_weights_v7.pt",
+  "notes": "Win rate vs classical eval: TBD (requires benchmark games)"
+}