Fix #1933: Using transport="stdio" closes real stdio, causing ValueError after se#2538

sherlock-488 wants to merge 3 commits intomodelcontextprotocol:mainmodelcontextprotocol/python-sdk:mainfrom

sherlock-488:deep-pr-forge/1933-using-transport-stdio-closes-real-stdio-caussherlock-488/python-sdk:deep-pr-forge/1933-using-transport-stdio-closes-real-stdio-causCopy head branch name to clipboard