wasm4pm-ex4pm-bindings regression adapter -- Phase 4 (statistics/ML), thin wrapper over an already-implemented, plain (non-wasm_bindgen) pub fn already present in the wasm4pm crate. See ~/wasm4pm/crates/wasm4pm-ex4pm-bindings/src/phase4_stats.rs for the real Rust implementation this binds.

See Ex4pmEngine.Wasm.Adapter for the shared six-state standing shape. Injected transport key: :regression_wasm_fun.