Owen Lin 1811b67a84
Support ephemeral forks of paginated threads ( #35251 ) ...
## What changed
- Allow `thread/fork` to create an ephemeral fork from paginated history when
`excludeTurns: true` is set, and return an invalid-request error otherwise.
- Preserve the selected history and fork preview without creating a rollout
path or exposing the ephemeral thread through `thread/list`.
## Testing
- Cover full-history and bounded ephemeral forks, active-turn boundaries,
preview selection, model input, and thread listing behavior.
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Owen Lin
1811b67a84