fix: surface stateful HTTP session crash cause#2742
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Summary
app.run()exception when a POST fails after the session stream closesClosedResourceErrorwhen reporting the failure back to an already closed writerFixes #2741.
To verify
python -m pytest tests\server\test_streamable_http_manager.py -qpython -m ruff check src\mcp\server\streamable_http.py src\mcp\server\streamable_http_manager.py tests\server\test_streamable_http_manager.pypython -m ruff format --check src\mcp\server\streamable_http.py src\mcp\server\streamable_http_manager.py tests\server\test_streamable_http_manager.pygit diff --check -- src\mcp\server\streamable_http.py src\mcp\server\streamable_http_manager.py tests\server\test_streamable_http_manager.py