haskelujah-parser-chirho

Full recursive-descent parser for Haskell source files with layout rule support. The main entry point is [cst_parser_chirho::ParserChirho] which produces a lossless green CST. [lower_chirho::lower_module_chirho] converts the CST to an AST. A lightweight [scan_module_header_chirho] scanner is also provided for quick module-name extraction without full parsing.