📦 deps(standards): vendor playbook

docs/standards/playbook/templates/cpp/conan/profiles/windows-x86_64-clang-cross

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+# Windows target cross (Clang) from Linux host
+#
+# IMPORTANT:
+# - This profile describes the *output platform* (target), so [settings] os=Windows.
+# - Use a "windows-..." prefix to avoid misleading readers into thinking the output is Linux.
+#
+# Profile naming convention (suggested):
+#   windows-<arch>-clang<major>-cross
+
+[settings]
+os=Windows
+arch=x86_64
+compiler=clang
+compiler.version=20
+compiler.runtime=static
+compiler.libcxx=libc++
+compiler.cppstd=23
+build_type=Release
+
+[conf]
+# Configure your cross clang executables here (do NOT hardcode a specific distro name in docs).
+tools.build:compiler_executables={"c": "<TOOLCHAIN_ROOT>/bin/x86_64-w64-mingw32-clang", "cpp": "<TOOLCHAIN_ROOT>/bin/x86_64-w64-mingw32-clang++"}
+
+# Tell Conan/CMake the target triple and platform.
+tools.gnu:host_triplet=x86_64-w64-mingw32
+tools.cmake.cmaketoolchain:generator=Ninja
+tools.cmake.cmaketoolchain:system_name=Windows
+tools.cmake.cmaketoolchain:system_processor=x86_64
+tools.cmake.cmaketoolchain:system_version=11
+
+# Keep Conan's cmake_layout output stable and predictable.
+tools.cmake.cmake_layout:build_folder=.
+tools.cmake.cmake_layout:build_folder_vars=[]
+
+[buildenv]
+# Resource compiler (optional; adjust if your toolchain uses a different windres name/path).
+RC=x86_64-w64-mingw32-windres
+