//! `integral-codegen` — pure-Rust build-time generation.
//!
//! Invoked from `build.rs` scripts to emit specialized per-angular-momentum
//! kernels and coefficient tables (e.g. Boys Chebyshev tables) as plain Rust
//! source — keeping all build-time code generation in one language rather than a
//! separate external generator toolchain.
//!
//! This crate currently exposes a minimal placeholder API.
/// Placeholder generator entry point.