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## Why Models sometimes need to pause briefly while waiting for external work, but using a shell command for that delay ties the wait to a process and does not naturally resume when new turn input arrives. ## What changed - add a built-in `sleep` tool behind the under-development `sleep_tool` feature - accept a bounded `duration_ms` argument, matching the millisecond convention used by unified exec - end the sleep early when either steered user input or mailbox input arrives - include elapsed wall-clock time in completed and interrupted outputs - emit a dedicated core `SleepItem` through `item/started` and `item/completed` - expose the sleep item as app-server v2 `ThreadItem::Sleep` and retain it in reconstructed thread history - regenerate the configuration schema for the new feature flag - regenerate app-server JSON and TypeScript schema fixtures ## Test plan - `just test -p codex-core sleep_tool_follows_feature_gate` - `just test -p codex-core any_new_input_interrupts_sleep` - `just test -p codex-app-server-protocol` - `just test -p codex-app-server sleep_emits_started_and_completed_items`