Fix type safety in OpenAIConversationsSession.get_items()#1901

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mshsheikh wants to merge 3 commits intoopenai:mainfrom

mshsheikh:patch-33

Commits on Oct 15, 2025

Commits on Oct 16, 2025

Narrow get_items once at return; remove per‑item casts and keep behavior unchanged.
mshsheikh
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