Merge master into cmake; resolve ci.yml conflicts

- Keep CMAKE_GENERATOR env on windows job
- Use matrix.os for windows runs-on (enables windows-11-arm)
- Drop code-coverage-old (removed in master)
- Retain CMake install + cmake/ctest steps from this branch

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: ViralBShah

.github/workflows/ci.yml

@@ -21,7 +21,9 @@ jobs:
       matrix:
         os:
           - ubuntu-latest
+          - ubuntu-24.04-arm
           - macos-latest
+          - macos-15-intel
     steps:
       - &git-checkout
         name: Checkout Openlibm
@@ -42,17 +44,18 @@ jobs:
         name: Test with CTest
         run: ctest --test-dir build --output-on-failure
   windows:
-    runs-on: windows-latest
+    runs-on: ${{ matrix.os }}
     env:
       CMAKE_GENERATOR: "MinGW Makefiles"
     strategy:
       fail-fast: false
       matrix:
         include:
-          - { sys: mingw64, env: x86_64 }
-          - { sys: mingw32, env: i686 }
-          - { sys: ucrt64,  env: ucrt-x86_64 }  # Experimental!
-          - { sys: clang64, env: clang-x86_64 } # Experimental!
+          - { os: windows-latest,  sys: mingw64,     env: x86_64 }
+          - { os: windows-latest,  sys: mingw32,     env: i686 }
+          - { os: windows-latest,  sys: ucrt64,      env: ucrt-x86_64 }  # Experimental!
+          - { os: windows-latest,  sys: clang64,     env: clang-x86_64 } # Experimental!
+          - { os: windows-11-arm,  sys: clangarm64,  env: clang-aarch64 } # Experimental!
     defaults:
       run:
         shell: msys2 {0}
@@ -68,23 +71,6 @@ jobs:
       - *make-test
       - *cmake-build
       - *ctest
-  code-coverage-old:
-    runs-on: ubuntu-latest
-    steps:
-      - *git-checkout
-      - name: Setup LCOV
-        uses: hrishikesh-kadam/setup-lcov@v1
-      - name: Build and Run tests
-        run: make coverage -j
-      # - name: Upload coverage to Codecov
-      #   uses: codecov/codecov-action@v6
-      #   with:
-      #     files: ./cov-html/libopenlibm.info
-      #     token: ${{ secrets.CODECOV_TOKEN }}
-      - uses: actions/upload-artifact@v7
-        with:
-          name: code-coverage-report-old
-          path: ./cov-html/
   code-coverage:
     runs-on: ubuntu-latest
     steps: