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feat(core): add ExternalProcessHandle for RAII process management - #3
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- Add `ExternalProcessHandle` wrapper around `popen()` using RAII semantics. - Manage process lifetime through `std::unique_ptr` with a custom `pclose()` deleter. - Throw `std::runtime_error` when process creation fails. - Implement `read_line()` to safely stream process output line by line. - Encapsulate low-level `FILE*` handling behind a simple C++ interface.
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ExternalProcessHandlewrapper aroundpopen()using RAII semantics.std::unique_ptrwith a custompclose()deleter.std::runtime_errorwhen process creation fails.read_line()to safely stream process output line by line.FILE*handling behind a simple C++ interface.