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* Add failback implementation of `PyCriticalSection_BeginMutex` for Python 3.13t * Add comment for Python version * Use `_PyCriticalSection_BeginSlow` * Add forward declaration * Fix forward declaration * Remove always true condition `defined(PY_VERSION_HEX)` * Detect musllinux * Add manylinux test * Use direct mutex locking for Python 3.13t `_PyCriticalSection_BeginSlow` is a private CPython function not exported on Linux. For Python < 3.14.0rc1, use direct `mutex.lock()`/`mutex.unlock()` instead of critical section APIs. * Empty commit to trigger CI * Empty commit to trigger CI * Empty commit to trigger CI * Run apt update before apt install * Remove unnecessary prefix * Add manylinux test with Python 3.13t * Simplify pycritical_section with std::unique_lock fallback for Python < 3.14 * Fix potential deadlock in make_iterator_impl for Python 3.13t Refactor pycritical_section into a unified class with internal version checks instead of using a type alias fallback. Skip locking in make_iterator_impl for Python < 3.14.0rc1 to avoid deadlock during type registration, as pycritical_section cannot release the mutex during Python callbacks without PyCriticalSection_BeginMutex. * Add reference for xfail message