release: 4.2.0#4

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Commits on Oct 23, 2025

feat(api): add `description` field to chats, make `title` optional
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Commits on Oct 30, 2025

fix(client): close streams without requiring full consumption
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Commits on Oct 31, 2025

chore(internal/tests): avoid race condition with implicit client cleanup
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Commits on Nov 4, 2025