📦 deps(standards): vendor playbook

docs/standards/playbook/templates/cpp/conan/profiles/linux-x86_64-clang

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+# Linux (Clang)
+#
+# Profile naming convention (suggested):
+#   linux-<arch>-clang<major>
+# If the repo only supports one clang version, you may omit the <major> suffix.
+
+[settings]
+os=Linux
+arch=x86_64
+compiler=clang
+compiler.version=20
+compiler.libcxx=libc++
+compiler.cppstd=23
+build_type=Release
+
+[conf]
+# Prefer pinning the exact compiler executables to avoid PATH drift.
+tools.build:compiler_executables={"c": "/usr/bin/clang", "cpp": "/usr/bin/clang++"}
+tools.cmake.cmaketoolchain:generator=Ninja
+
+# Keep Conan's cmake_layout output stable and predictable.
+tools.cmake.cmake_layout:build_folder=.
+tools.cmake.cmake_layout:build_folder_vars=[]
+