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)
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