Refactor formula parser tests to use more concise assert!(matches!(...)) syntax. Simplify the formula generator implementation by removing unused expression variants and using expect() for mandatory grammar rules. Add a regression test for hyphenated identifiers in bare names. Co-Authored-By: fiddlerwoaroof/git-smart-commit (gemma-4-26B-A4B-it-UD-Q5_K_XL.gguf)