Enable paginated thread history in app-server - #33364
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## What changed - Allow `thread/start` to select experimental `historyMode: "paginated"` when the thread store supports turn and item pagination. - Resume paginated threads with bounded model context and require `excludeTurns: true` instead of loading full history. - Return `turnsBackwardsCursor` and `itemsBackwardsCursor` from `thread/resume` so clients can hydrate durable history through `thread/turns/list` and `thread/items/list` while newer records arrive through live notifications. - Reject operations that still require full history, including `initialTurnsPage`, `thread/read` with `includeTurns: true`, `thread/rollback`, and detached review. - Make item cursors independent of the optional `turnId` filter. ## Testing - Cover paginated thread start, cold and live resume, backwards cursor hydration, metadata reads, unsupported operations, and stores without pagination support. GitOrigin-RevId: c42f9b268e29d049843330f474fa3ecde12f5b8a
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Enable paginated thread history in app-server
What changed
thread/startto select experimentalhistoryMode: "paginated"when the thread store supports turn and item pagination.excludeTurns: trueinstead of loading full history.turnsBackwardsCursoranditemsBackwardsCursorfromthread/resumeso clients can hydrate durable history throughthread/turns/listandthread/items/listwhile newer records arrive through live notifications.initialTurnsPage,thread/readwithincludeTurns: true,thread/rollback, and detached review.turnIdfilter.Testing