Always assign response item IDs - #34645
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## What changed - Assign IDs to client-created response items in every session, including streamed items, forked history, compaction results, and non-OpenAI provider requests. - Preserve server-provided IDs and stable generated IDs across persisted and resumed conversations while continuing to omit unprefixed server IDs from outbound requests. - Retire `features.item_ids` as a configurable feature. Existing configuration and CLI toggles remain accepted as compatibility no-ops. ## Testing - Cover default ID assignment, persistence and resume behavior, remote compaction, provider requests, WebSocket requests, and removed-feature compatibility. GitOrigin-RevId: 7a09e2d07d2606c2ef1e8e2283d36cb555557eae
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Always assign response item IDs
What changed
features.item_idsas a configurable feature. Existing configuration and CLI toggles remain accepted as compatibility no-ops.Testing