Track model and personality in world state - #35530
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## What changed - Add model and personality sections to the persisted world-state snapshot. - Generate model-switch and personality instructions through world-state diffs, including when prior state must be inferred during replay. - Keep those instruction fragments in standalone developer messages instead of merging them with adjacent context updates. ## Testing - Cover initial, unchanged, and changed model and personality states. - Verify that model changes are recorded in rollout world-state items. GitOrigin-RevId: 497e29cf38cac08e992e546df900f6f8b01120f9
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Track model and personality in world state
What changed
Testing