Lean 4 formalization of the decision tree + MLP ensemble architecture.
Axiomatizes Float properties (sigmoid bounds, ReLU nonnegativity) since
Lean's Float ops are extern-backed. Proves MLP output is bounded in (0,1)
and ensemble output is always a valid decision. No mathlib dependency.
Signed-off-by: Sienna Meridian Satterwhite <sienna@sunbeam.pt>
