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7b8d671f52
introduces native llvm source-based coverage as an alternative to the existing gcov + gcovr pipeline. driven by a new -Dcoverage_tool cache variable (default 'gcov' for backwards compat; 'llvm' enables -fprofile-instr-generate / -fcoverage-mapping + llvm-profdata + llvm-cov). cmake: - RippledSettings.cmake: add coverage_tool with validation - RippledInterface.cmake: split coverage compile/link flags by tool - RippledCov.cmake: dispatch to the new helper when tool=llvm - CodeCoverageLLVM.cmake (new): setup_target_for_coverage_llvm() driving profraw -> profdata -> export with format-aware output (lcov/json/txt/html) ci: - new clang-20 llvm-cov coverage matrix row (apt.llvm.org bootstrap for clang >= 19 since 24.04 default repos cap at clang-18) - conditional install of llvm-N vs gcovr based on coverage_tool - artifact + codecov upload generalised to coverage.lcov | coverage.xml - coverage cmake-args switched to *_FLAGS_DEBUG so the build action's stdlib flag isn't clobbered temp (revert before merging to dev): - matrix narrowed to just the llvm-cov row on non-main refs so we can iterate without burning runners - 'coverage-llm' added to push trigger for direct-push CI runs