GHA OS test matrix

Author: zigai

.github/workflows/tests.yml

@@ -1,19 +1,24 @@
 name: Tests
 on: [push, pull_request]
+
 jobs:
   tests:
-    runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
         python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
+    runs-on: ${{ matrix.os }}
+
     steps:
       - uses: actions/checkout@v5
+
       - name: Install uv
         uses: astral-sh/setup-uv@v7
 
       - name: Set up Python ${{ matrix.python-version }}
         run: uv python install ${{ matrix.python-version }}
+
       - name: Install dependencies
         run: uv sync --extra test --python ${{ matrix.python-version }}