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## Why Clients need a per-thread Daybreak toggle that survives restarts and can be restored on resume without changing the access program of an active or future turn. ## What changed - Add experimental `daybreakEnabled` support to `thread/metadata/update` and expose the saved value on thread responses. - Store the preference in SQLite, including for threads without a first turn, and preserve it through reads, resumes, reconciliation, and restarts. - Copy the preference when forking a thread while keeping subsequent updates independent. - Keep `daybreakEnabled` separate from the per-turn `cyberAccessProgram` field; app-server does not derive one from the other. ## Testing - Cover persistence across restarts, cold reads, reconciliation, and forks. - Verify metadata updates do not alter the access program of active or later turns. GitOrigin-RevId: bcf987a9fcd7b0ac8a88b1c8f0df06b33ed8ad6e