CI(chore[control]): add control-engine pytest run

why: CI must exercise the control-mode engine alongside subprocess.
what:
- Add GitHub Actions step to run pytest with --engine=control per tmux version

Author: tony

.github/workflows/tests.yml

@@ -83,6 +83,13 @@ jobs:
           COV_CORE_SOURCE: .
           COV_CORE_CONFIG: .coveragerc
           COV_CORE_DATAFILE: .coverage.eager
+      - name: Test with pytest (control engine)
+        continue-on-error: ${{ matrix.tmux-version == 'master' }}
+        run: |
+          sudo apt install libevent-2.1-7
+          export PATH=$HOME/tmux-builds/tmux-${{ matrix.tmux-version }}/bin:$PATH
+          tmux -V
+          uv run py.test --engine=control -n auto --verbose
       - uses: codecov/codecov-action@v5
         with:
           token: ${{ secrets.CODECOV_TOKEN }}