[v2] ClientSession runs on JSONRPCDispatcher; BaseSession removed#2838

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maxisbey/v2-client-dispatcher-swap

Commits on Jun 11, 2026

Add courtesy-cancel controls and bound shielded dispatcher writes
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Contain notification-handler exceptions in the dispatcher
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Add an on_stream_exception observer to the dispatcher
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Collapse the dispatcher constructor overloads with a defaulted TypeVar
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Move ClientSession onto JSONRPCDispatcher and delete BaseSession
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Cover the remaining client-session branches and document the migration
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Stop logging an error when the standalone SSE stream closes mid-listen
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Accept a pre-built dispatcher via a constructor keyword
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Restore full coverage after the BaseSession deletion
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Tighten dispatcher abandon-path writes and response invariants
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Harden ClientSession enter/exit and fault delivery
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Pin initialize-abandon suppression and tidy the interaction suite
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Exercise the standalone SSE teardown window deterministically
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Document the dispatcher behavior changes in the migration guide
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