Splits the monolithic tree-sitter.ts (3,358 lines) into modular files: - 14 language config files under src/extraction/languages/ - 3 standalone extractors (Liquid, Svelte, DFM) - Shared helpers and types modules to avoid circular imports Also fixes a bug where Java's extractImport hook incorrectly set handledRefs: true, preventing unresolved reference creation and degrading codegraph_explore results for Java codebases. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>