Seed realtime V3 sessions with initial text items#34067
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## What changed - Add an optional `initialItems` field to `thread/realtime/start` for seeding realtime V3 session history with `user`, `developer`, and `assistant` text. - Encode the items in Frameless Bidi session bootstrap payloads for websocket and WebRTC transports while preserving existing payloads when the list is omitted or empty. - Reject non-empty initial items for V1 and V2, more than 128 items, any item over 8,192 estimated tokens, or a combined total over 8,192 estimated tokens. ## Testing - Cover protocol serialization, app-server forwarding, websocket and WebRTC payloads, empty-list compatibility, version checks, and size limits. GitOrigin-RevId: 09af367f9a07543e3f8d59b7fa5387f932dc5a6a
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Seed realtime V3 sessions with initial text items
What changed
initialItemsfield tothread/realtime/startfor seedingrealtime V3 session history with
user,developer, andassistanttext.and WebRTC transports while preserving existing payloads when the list is
omitted or empty.
over 8,192 estimated tokens, or a combined total over 8,192 estimated tokens.
Testing
payloads, empty-list compatibility, version checks, and size limits.