ci: narrow per-PR matrix to 3.12/3.13; install [optional] uniformly

Per-PR CI now tests only the first-class Python versions (3.12, 3.13).
Wide-span 3.9-3.14 verification moves to PyAutoBuild's python_matrix.yml
workflow (weekly + on-demand).

Install commands now always use the [optional] extra so JAX is
available on both 3.12 and 3.13 (the conftest.py eager `import jax`
was failing on 3.13 because the previous CI only added [optional] for
3.12).

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

Author: 2 people

.github/workflows/main.yml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13', '3.14']
+        python-version: ['3.12', '3.13']
     steps:
     - name: Checkout PyAutoConf
       uses: actions/checkout@v2
@@ -37,12 +37,7 @@ jobs:
         pip3 install setuptools
         pip3 install wheel
         pip3 install pytest coverage pytest-cov
-        pip install ./PyAutoConf ./PyAutoArray
-        if [ "${{ matrix.python-version }}" = "3.12" ]; then
-          pip install "./PyAutoArray[optional]"
-        else
-          pip install numba pynufft
-        fi
+        pip install ./PyAutoConf "./PyAutoArray[optional]"
 
     - name: Extract branch name
       shell: bash