fix(streamable_http): send response on ClientDisconnect to satisfy middleware chains#5

wiggzz merged 2 commits intodbt-labs/patched-1.27.0dbt-labs/mcp-python-sdk:dbt-labs/patched-1.27.0from

wj/DI-3218-clientdisconnect-send-responsedbt-labs/mcp-python-sdk:wj/DI-3218-clientdisconnect-send-responseCopy head branch name to clipboard