ci: trim test matrix to Linux full × macOS/Windows newest

The `test` job existed as a fast-feedback stage ahead of
`build-wheels`, which runs cibuildwheel on every (Python × OS)
combination.  Running the full 3 × 4 matrix in `test` as well
just re-finds the same issues in parallel.

Now: full Python 3.11–3.14 matrix on Linux (where most contributors
develop), plus 3.14-only smoke tests on macOS and Windows — still
exercising the `libomp` install (macOS) and MSVC activation
(Windows) steps, since those gate on `runner.os` not the Python
version.  Cibuildwheel remains the comprehensive backstop for ABI
and build regressions on older Pythons across all three OSes.

Same trim already applied to pylu (f73df0e) and pydgq (008da1b).
Landing now that 1.0.0 is out; will ship in 1.0.1.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Technologicat

.github/workflows/ci.yml

@@ -44,8 +44,23 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        # Full Python matrix on Linux; newest Python only on macOS and Windows.
+        # Rationale: this `test` job exists for fast feedback ahead of the
+        # `build-wheels` job, which runs `cibuildwheel` on every (Python × OS)
+        # combination anyway.  Duplicating the full 12-job matrix here would
+        # re-find the same issues in parallel.  Trimming keeps broad Linux
+        # coverage (where most contributors develop), smoke-tests macOS and
+        # Windows on the newest Python — still exercising the libomp install
+        # (macOS) and MSVC activation (Windows) steps below — and leaves
+        # cibuildwheel as the comprehensive backstop for ABI/build regressions
+        # on older Pythons across all three OSes.
+        os: [ubuntu-latest]
         python-version: ["3.11", "3.12", "3.13", "3.14"]
+        include:
+          - os: macos-latest
+            python-version: "3.14"
+          - os: windows-latest
+            python-version: "3.14"
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v6