Fix clang-cl ASan preset setup

docs/modernization/roadmap.md

@@ -191,7 +191,10 @@ Goal: turn the build into an error-finding system before deep refactors.
 Status: in progress. Initial warning/sanitizer option targets, `vcpkg.json`,
 a validated Windows headless vcpkg preset, `pp_ui_core` support for vcpkg
 tinyxml2 on that preset, and a headless `panopainter_validate_shaders` target
-exist. Dependency migration is not complete until remaining component
+exist. `windows-clangcl-asan` now configures as a headless Ninja/clang-cl ASan
+preset and uses the release MSVC runtime required by clang-cl ASan, but local
+ASan builds are blocked by DEBT-0014 until Clang and the selected MSVC STL are
+compatible. Dependency migration is not complete until remaining component
 dependencies and mobile/Apple triplets are validated.
 
 Implementation tasks:
@@ -545,6 +548,7 @@ ctest --preset desktop-fast-vcpkg --build-config Debug
 cmake --preset android-arm64
 powershell -ExecutionPolicy Bypass -File scripts\automation\platform-build.ps1 -Presets android-arm64
 powershell -ExecutionPolicy Bypass -File scripts\automation\package-smoke.ps1 -Preset windows-msvc-default -Configuration Debug
+cmake --fresh --preset windows-clangcl-asan
 ```
 
 Results:
@@ -585,6 +589,10 @@ Results:
 - `pp_ui_core` built and tested against vcpkg tinyxml2 on
   `windows-msvc-vcpkg-headless` and against the vendored fallback on
   `windows-msvc-default` and `android-arm64`.
+- `windows-clangcl-asan` configures headlessly with clang-cl 18.1.8 and
+  release MSVC runtime selection; build remains blocked and debt-tracked in
+  DEBT-0014 because the selected VS 2026-preview STL requires Clang 20 or
+  newer.
 - `PanoPainter.exe` built through CMake at
   `out/build/windows-msvc-default/Debug/PanoPainter.exe`.
 - PowerShell build/test automation wrappers return JSON summaries and passed