fix: collapse single-exception ExceptionGroups from task groups#2245

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Varun6578 wants to merge 5 commits intomodelcontextprotocol:mainfrom

Varun6578:fix/collapse-exception-group

Commits on Mar 7, 2026

fix: collapse single-exception ExceptionGroups from task groups

Varun Sharma
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fix: add Python 3.10 compat for BaseExceptionGroup import

Varun Sharma
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fix: resolve pyright and coverage CI failures

Varun Sharma
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Copilot
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fix: use pragma lax no cover for version-conditional imports, add regression tests

Varun Sharma
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test: add start() not-entered guard to completeness test

Varun Sharma
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