fix: check AbortSignal in handleAutomaticTaskPolling to stop cancelled requests#2019

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blackwell-systems wants to merge 3 commits intomodelcontextprotocol:mainfrom

blackwell-systems:fix/automatic-task-polling-abort-signal

Commits on May 5, 2026

fix: check AbortSignal in handleAutomaticTaskPolling to stop cancelled requests
blackwell-systems
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add changeset for patch release
blackwell-systems
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fix: use InternalError code (RequestCancelled does not exist in enum)
blackwell-systems
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