add: compiler

src/lib.rs

@@ -2,6 +2,13 @@
 //!
 //! Loads the BNF grammar embedded at compile time, builds a [`bnf::GrammarParser`],
 //! and exposes helpers used by both the compiler binary and the demo binary.
+//!
+//! Also provides the typed AST ([`ast`]), BNF-to-AST lowering pass ([`lower`]),
+//! and LLVM code-generator ([`codegen`]) used by the compiler pipeline.
+
+pub mod ast;
+pub mod lower;
+pub mod codegen;
 
 use bnf::{Grammar, Term};