- Add benchmark tests for highlighting, query execution, and tagging with incremental variants
- Add fuzz tests for query compilation and tagger to catch panics on malformed input
- Add stress tests for large files, deeply nested expressions, and edge cases (nil/empty/binary)
- Remove unused canUseDFALexer and languageCompatible methods from Parser
- Update .gitignore to exclude parity_report build artifact
- Use 500-function Go files and arithmetic expressions for realistic load testing