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## Why Tool families already disagree on what their existing `duration` fields mean, so lifecycle latency should live on the shared item envelope instead of being inferred from per-tool execution fields. Carrying that envelope through app-server notifications gives downstream consumers one reusable timing signal without pretending every tool has the same execution semantics. ## What changed - Adds `started_at_ms` to core `ItemStartedEvent` values and `completed_at_ms` to core `ItemCompletedEvent` values. - Populates those timestamps in the shared session lifecycle emitters, so protocol-native items get timing without each producer tracking its own clock state. - Exposes `startedAtMs` on app-server `item/started` notifications and `completedAtMs` on `item/completed` notifications. - Maps the lifecycle timestamps through the app-server boundary while leaving legacy-converted notifications nullable when no lifecycle timestamp exists. - Regenerates the app-server JSON schema and TypeScript fixtures for the notification-envelope change and updates downstream fixtures that construct those notifications directly. - Extends the existing web-search and image-generation integration flows to assert the new lifecycle timestamps on the native item events. ## Verification - `cargo check -p codex-protocol -p codex-core -p codex-app-server-protocol -p codex-app-server -p codex-tui -p codex-exec -p codex-app-server-client` - `cargo test -p codex-core --test all web_search_item_is_emitted` - `cargo test -p codex-core --test all image_generation_call_event_is_emitted` - `cargo test -p codex-app-server-protocol` --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/openai/codex/pull/20514). * #18748 * #18747 * #17090 * #17089 * __->__ #20514