fix: suppress MCPServer KeyboardInterrupt tracebacks#2813
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Summary
KeyboardInterruptat the synchronousMCPServer.run()boundarystdio,sse, andstreamable-httpdispatch paths with a focused regression testCloses #2663.
To verify
uv run --frozen pytest tests/server/mcpserver/test_server.py::TestServer::test_run_suppresses_keyboard_interrupt -quv run --frozen pytest tests/server/mcpserver/test_server.py -quv run --frozen ruff check src/mcp/server/mcpserver/server.py tests/server/mcpserver/test_server.pyuv run --frozen pyright src/mcp/server/mcpserver/server.py tests/server/mcpserver/test_server.pygit diff --check