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Allow specifying extra compiler flags (warning flags, preprocessor definitions, etc.) via a new 'compile_options' entry in the idf-build-file frontmatter. The options are applied to the source file via target_compile_options in the generated main component CMakeLists, with CMake quoting so that flags like -DMSG="hello world" reach the compiler exactly as written. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>