EXPERIMENT: Re-enable hanging test to verify CI log buffering fix

This is a temporary commit to verify that the unbuffered stdout fix
makes the hanging test visible in CI logs. REVERT THIS COMMIT after
confirming the output appears.

Author: rwgk

tests/test_with_catch/test_subinterpreter.cpp

@@ -94,7 +94,9 @@ TEST_CASE("Single Subinterpreter") {
 // "Move Subinterpreter" test is disabled on free-threaded Python 3.14+ due to a hang
 // in Py_EndInterpreter() when the subinterpreter is destroyed from a different thread
 // than it was created on. See: https://github.com/pybind/pybind11/pull/5933
-#    if PY_VERSION_HEX >= 0x030D0000 && !(PY_VERSION_HEX >= 0x030E0000 && defined(Py_GIL_DISABLED))
+// EXPERIMENT: Temporarily re-enable to test CI log buffering fix - REVERT THIS
+#    if PY_VERSION_HEX >= 0x030D0000                                                              \
+        && !(0 && PY_VERSION_HEX >= 0x030E0000 && defined(Py_GIL_DISABLED))
 TEST_CASE("Move Subinterpreter") {
     std::unique_ptr<py::subinterpreter> sub(new py::subinterpreter(py::subinterpreter::create()));