feat: add syntect-based syntax highlighting module to native engine (#227)
Port the highlight module from Oh My Pi's pi-natives crate. Provides
ANSI-colored syntax highlighting with scope-based semantic token matching
across 11 categories (comment, keyword, function, variable, string, number,
type, operator, punctuation, inserted, deleted).
Exposed N-API functions:
- highlightCode(code, lang, colors) -> ANSI-highlighted string
- supportsLanguage(lang) -> boolean
- getSupportedLanguages() -> string[]
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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