jimxie-oai 0d6838318f Expose and persist image generation IDs (#57552) ...

## What changed

Expose the backend-provided `generationId` on image-generation items and preserve it through legacy completion events, thread history reconstruction, and rollout migration. Default missing IDs to `None` for older history.

Update the generated JSON schemas, TypeScript types, and Python models to include the nullable field.

## Testing

Extend coverage for ID serialization round trips, completed-item notifications, persisted and resumed history, and legacy rollout migration.

GitOrigin-RevId: a7f06faa7ac6833417b257a535d2901c03b79135

2026-10-27 19:43:27 +00:00

80 KiB

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