- Update Roux.Types: add SectionBodyItem (SecStep/SecComment/SecNote),
StepEndComment, remove StepNote (notes are now section-level)
- Rewrite Roux.Parser using Parsec for inline elements, text-splitting
for file-level structure
- Handle full-line -- comments, > notes, = Name = section headers
- Handle = Name (w/ and w/o closing =), == Name == variations
- Handle end-of-line backslash line breaks within steps
- Update tests to match new model + 3 EasyPancakes integration tests
- Add expectTextStep helper at module level
