Behind the `training` feature flag (burn 0.20 + ndarray + autodiff).
Trains a single-hidden-layer MLP with Adam optimizer and weighted BCE
loss, plus a CART decision tree using Gini impurity. Exports trained
weights as Rust const arrays that compile directly into the binary.
Signed-off-by: Sienna Meridian Satterwhite <sienna@sunbeam.pt>