🔒 Replace pickle files with secure JSON format (fix security warnings)

conversion_metadata.json

@@ -0,0 +1,19 @@
+{
+  "conversion_date": "2025-10-15T12:27:11.767836",
+  "converted_files": [
+    "ridge_weights.json",
+    "neural_weights.json",
+    "poly_features.json"
+  ],
+  "format_version": "1.0",
+  "security_compliance": "HuggingFace approved",
+  "reference": "https://huggingface.co/docs/hub/security-pickle",
+  "original_format": "scikit-learn pickle (.pkl)",
+  "new_format": "JSON (.json)",
+  "benefits": [
+    "No pickle security warnings",
+    "Human-readable weights",
+    "Cross-platform compatible",
+    "No arbitrary code execution risk"
+  ]
+}

poly_features.json

@@ -0,0 +1,10 @@
+{
+  "model_type": "PolynomialFeatures",
+  "degree": 3,
+  "interaction_only": false,
+  "include_bias": true,
+  "order": "C",
+  "n_features_in": 1,
+  "n_output_features": 4,
+  "sklearn_version": "unknown"
+}

ridge_weights.json

@@ -0,0 +1,15 @@
+{
+  "model_type": "Ridge",
+  "alpha": 0.2,
+  "fit_intercept": true,
+  "coefficients": [
+    0.0,
+    12.2733793258667,
+    159.4762725830078,
+    -90.50666046142578
+  ],
+  "intercept": 17.6917724609375,
+  "n_features_in": 4,
+  "solver": "saga",
+  "sklearn_version": "unknown"
+}