Fix stateless HTTP task accumulation causing memory leak#2145

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wiggzz wants to merge 15 commits intomodelcontextprotocol:mainfrom

wiggzz:fix/stateless-task-group-leak

Commits on Mar 9, 2026

Fix stateless HTTP task accumulation causing memory leak (#756)

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Fix issue reference from #756 (closed) to #1764 (open)

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Fix CI: coverage, ruff format, and remove unused handle_list_tools

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Remove over-conservative pragma: no cover annotations

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Revert sleep(0) approach — coverage was racy

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Move pragma: no cover to logger.debug (the unreachable line)

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Move terminate() after task group exit for deterministic cancellation

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Use lax no cover for timing-dependent exception paths; fix ruff format

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Fix ruff format and Python 3.11 coverage false negatives in test

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Remove unused Tool import flagged by ruff

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Fix pyright errors for private task group access in test

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Add assertion for session_manager not None (pyright)

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Run handle_request in caller context, not as child task

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Add graceful SSE drain on session manager shutdown
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Fix CI: pyright type errors in test and strict-no-cover false positive
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