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* Replace pre-commit hook with CMake-generated clang-format check Replace the old pre-commit hook that shelled out to PowerShell and never blocked commits (-NoFail) with a CMake-generated hook that calls clang-format directly on staged C/C++ files. - Add tools/hooks/pre-commit.in as a CMake template - CMake resolves the clang-format path at configure time via LLVM_INSTALL_DIR, matching the existing FormatSource.ps1.in pattern - Hook blocks commits on formatting errors, skips gracefully if clang-format is not available (cmake not yet run) - ~5x faster than the old PowerShell approach (~0.5s vs ~2.6s) * Make pre-commit hook behavior configurable via WSL_PRE_COMMIT_MODE Add WSL_PRE_COMMIT_MODE CMake cache variable with three modes: - warn (default): report formatting issues without blocking commit - error: block commit when formatting issues are found - fix: auto-format files and re-stage them Also addresses PR feedback: - Generate hook into build tree, copy to source tree for out-of-source builds - Use repo-local tools/clang-format.exe instead of LLVM_INSTALL_DIR path - Use @ONLY in configure_file to avoid shell variable substitution issues - Document modes in dev-loop.md and UserConfig.cmake.sample Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> --------- Co-authored-by: Ben Hillis <benhill@ntdev.microsoft.com> Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>