ci: test 3.14t in the pytest matrix instead of a separate job (#138)

Author: lesnik512

.github/workflows/_checks.yml

@@ -34,6 +34,7 @@ jobs:
           - "3.12"
           - "3.13"
           - "3.14"
+          - "3.14t"
     steps:
       - uses: actions/checkout@v6
       - uses: extractions/setup-just@v4
@@ -44,20 +45,9 @@ jobs:
       - run: uv python install ${{ matrix.python-version }}
       - run: uv python pin ${{ matrix.python-version }}
       - run: just install
-      - run: just test-ci
-  pytest-freethreaded:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v6
-      - uses: extractions/setup-just@v4
-      - uses: astral-sh/setup-uv@v8.2.0
-        with:
-          enable-cache: true
-          cache-dependency-glob: "**/pyproject.toml"
-      - run: uv python install 3.14t
-      - run: uv python pin 3.14t
-      - run: just install
-      - run: uv run --no-sync python -c "import sys; assert not sys._is_gil_enabled(), 'GIL is enabled'"
+      - name: Confirm the interpreter is free-threaded
+        if: matrix.python-version == '3.14t'
+        run: uv run --no-sync python -c "import sys; assert not sys._is_gil_enabled(), 'GIL is enabled'"
       - run: just test-ci
   floors:
     # Every other job resolves newest, so the declared floors are a claim nothing installs.