Phase 3b: Real tree-sitter integration (Steps 45-49)
Replace TreeSitterParser stubs with real tree-sitter C bindings for Python, C++, and Elisp parsing. Add tree-sitter core via vcpkg and language grammars via FetchContent. Implement CST-to-AST converters with auto-annotation, memory pattern detection, error recovery, and ParseResult/ParseDiagnostic types. All 34 tests pass (6+7+6+8+7). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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