fix: update tests and examples for new on_* constructor kwargs API#2034

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maxisbey wants to merge 22 commits intomainfrom

sketch/lowlevel-server-v2-kwargs-claude

Commits on Feb 9, 2026

refactor: replace lowlevel Server decorators with on_* constructor kwargs
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fix: remove unnecessary request_ctx contextvar from notification handlers
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fix: address PR review comments on migration docs and type hints
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fix: collapse single-arg Server() to one line in migration example
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refactor: replace _create_handler_kwargs with private methods on MCPServer
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refactor: use dict instead of list of tuples for handler maps
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docs: document keyword-only Server constructor params in migration guide
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refactor: inline _register_default_task_handlers into enable_tasks
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feat: add on_* handler kwargs to enable_tasks for custom task handlers
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Commits on Feb 10, 2026