- Add loadPristineAst method to CompilerBase for independent AST loading
- Introduce PreparedProjectCacheTrait with conservative whole-project caching mechanism
- Implement translation unit splitting for large C++ files with splitLargeTranslationUnit
- Add preprocessing warning count tracking in CompilerDiagnosticTrait
- Enhance gen_stub.php to use cached AST when available instead of reparsing
- Improve incremental compilation checks with splitTranslationUnits validation
- Add comprehensive test coverage for AST caching, prepared project cache, and translation unit splitting
- Optimize precompiled header manager with dependency digest caching and improved invalidation
- Implement file digest memoization for faster native compilation input processing
- Add support for persistent AST cache reuse across compiler processes
- Replace direct array access with SymbolRepository for functions, classes, interfaces
- Introduce DiagnosticReporter interface with CLI and throwing implementations
- Add NativeBuilder for compile/link command management and parallel processing
- Create CommandOptions base class for compile and link options handling
- Implement project YAML loader with PHP version and OS family conditions
- Remove old array properties and update all related method calls
- Update compiler diagnostic methods to use new reporter pattern
- Refactor native compilation to use builder pattern with proper options
- Modify test utilities to work with new symbol repository structure
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