fix(ci): pass target triple for Windows ARM64 native runner

The pixi-managed clang on windows-11-arm is an x64 binary running
under emulation, defaulting to x64 code generation.  Pass
CLICE_TARGET_TRIPLE so it generates ARM64 code that matches the
ARM64 LLVM libraries.  Tests still run natively on the ARM64 runner.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: 16bit-ykiko

.github/workflows/test-cmake.yml

@@ -38,6 +38,7 @@ jobs:
             target_triple: aarch64-linux-gnu
           - os: windows-11-arm
             build_type: RelWithDebInfo
+            target_triple: aarch64-pc-windows-msvc
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout repository