In decompose_protocol.py, "_decompose_with_context_" is never called without a valid DecompositionContext. However, many of the type annotations, both in decompose_protocol.py and in _decompose_with_context_ implementations across the project, specify context: DecompositionContext | None = None. The None option should be removed from all of these except at the very top level decompose_protocol entrypoints (decompose, decompose_once, and decompose_once_with_qubits), since AFAICT they'll never be hit.