refactor: remove molecule_ci_guard — adds complexity, no value

The cross-runner cancellation guard was killing healthy molecule slots
when unhealthy slots failed, defeating fail-fast: false. Replace with
direct molecule test execution.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

.gitea/workflows/ci.yml

@@ -200,7 +200,6 @@ jobs:
           fi
       - name: Run molecule tests
         if: env.SKIP != 'true' && steps.prune.outputs.should-run != 'false'
-        shell: bash
         env:
           CI_GITEA_API_TOKEN: ${{ secrets.CI_GITEA_API_TOKEN }}
           CI_GITEA_USERNAME: ${{ vars.CI_GITEA_USERNAME }}
@@ -233,23 +232,19 @@ jobs:
             fi
             export ANSIBLE_ALLOW_BROKEN_CONDITIONALS=true
             echo "--- Running: $scenario on $platform_name ---"
-            pushd "$role_dir" >/dev/null
             if [ "$scenario" = "default" ]; then
-              molecule test || {
+              molecule test --cwd "$role_dir" || {
                 echo "FAILED: $pair — running molecule destroy"
-                molecule destroy 2>/dev/null || true
-                popd >/dev/null
+                molecule destroy --cwd "$role_dir" 2>/dev/null || true
                 exit 1
               }
             else
-              molecule test -s "$scenario" || {
+              molecule test -s "$scenario" --cwd "$role_dir" || {
                 echo "FAILED: $pair — running molecule destroy"
-                molecule destroy -s "$scenario" 2>/dev/null || true
-                popd >/dev/null
+                molecule destroy -s "$scenario" --cwd "$role_dir" 2>/dev/null || true
                 exit 1
               }
             fi
-            popd >/dev/null
             echo "PASSED: $pair"
             docker system prune -af --volumes 2>/dev/null || true
           done