feat: add kernel preload

deep_gemm/__init__.py

@@ -137,3 +137,14 @@ _ensure_initialized()
 
 if __debug__:
     _verify_ops_loaded()
+    
+# Preload cached kernels if enabled via environment variable
+if os.environ.get('DG_PRELOAD_KERNELS', '0') == '1':
+    try:
+        deep_gemm_cpp.preload_kernels()
+    except Exception as e:
+        # Preloading failure should not block initialization
+        import warnings
+        warnings.warn(f"Failed to preload DeepGEMM kernels: {e}")
+
+__version__ = '2.1.2'