- Add .rustfmt.toml with comprehensive formatting rules for consistent code style
- Set max_width to 100 and tab_spaces to 4 with edition "2026"
- Enable import reordering and grouping with StdExternalCrate strategy
- Configure comment wrapping at 80 characters and enable comment normalization
- Enable field init shorthand, try shorthand, and format code in doc comments
- Set trailing comma to "Vertical" and match_block_trailing_comma to true
