fix(ci): use macos-26 runner for std::jthread support

Author: trvon

.github/workflows/ci.yml

@@ -140,7 +140,7 @@ jobs:
   # macOS Tests (ARM64 - NEON)
   # =============================================================================
   test-macos:
-    runs-on: macos-latest
+    runs-on: macos-26
 
     steps:
       - uses: actions/checkout@v4
@@ -151,13 +151,10 @@ jobs:
 
       - name: Configure
         run: |
-          # macOS 11.0+ required for std::jthread (libc++ LLVM 11 sync primitives)
           meson setup build \
             -Dbuildtype=debugoptimized \
             -Denable_simd_avx=false \
-            -Denable_simd_neon=true \
-            -Dcpp_args="-mmacosx-version-min=11.0" \
-            -Dcpp_link_args="-mmacosx-version-min=11.0"
+            -Denable_simd_neon=true
 
       - name: Build
         run: meson compile -C build