Move sleep items to the extension-owned lifecycle path (#33159)

## What changed

- Define `SleepItem` in `codex-extension-items` and carry `clock.sleep` events through `TurnItem::Extension`.
- Preserve sleep persistence, thread-history reconstruction, and the app-server's `type: "sleep"` schema while reusing the extension-owned type.

## Testing

- Add serialization coverage for the `clock.sleep` extension wire shape and its protocol wrapper.
- Update sleep lifecycle and thread-history tests to exercise the extension-owned item.

GitOrigin-RevId: 34bb33ed9b90a09bf4744aafdb56e019c717a168

codex-rs/app-server-protocol/src/protocol/thread_history.rs

@@ -599,8 +599,7 @@ impl ThreadHistoryBuilder {
         );
         let should_upsert = match item {
             codex_protocol::items::TurnItem::Plan(plan) => !plan.text.is_empty(),
-            codex_protocol::items::TurnItem::Sleep(_)
-            | codex_protocol::items::TurnItem::HookPrompt(_)
+            codex_protocol::items::TurnItem::HookPrompt(_)
             | codex_protocol::items::TurnItem::CommandExecution(_)
             | codex_protocol::items::TurnItem::DynamicToolCall(_)
             | codex_protocol::items::TurnItem::CollabAgentToolCall(_)
@@ -1588,6 +1587,7 @@ mod tests {
     use super::*;
     use crate::protocol::v2::CommandExecutionSource;
     use codex_extension_items::ExtensionItem as CoreExtensionItem;
+    use codex_extension_items::sleep::SleepItem as CoreSleepItem;
     use codex_protocol::ThreadId;
     use codex_protocol::dynamic_tools::DynamicToolCallOutputContentItem as CoreDynamicToolCallOutputContentItem;
     use codex_protocol::items::CommandExecutionItem as CoreCommandExecutionItem;
@@ -1595,7 +1595,6 @@ mod tests {
     use codex_protocol::items::EnteredReviewModeItem as CoreEnteredReviewModeItem;
     use codex_protocol::items::ExitedReviewModeItem as CoreExitedReviewModeItem;
     use codex_protocol::items::HookPromptFragment as CoreHookPromptFragment;
-    use codex_protocol::items::SleepItem as CoreSleepItem;
     use codex_protocol::items::TurnItem as CoreTurnItem;
     use codex_protocol::items::UserMessageItem as CoreUserMessageItem;
     use codex_protocol::items::build_hook_prompt_message;
@@ -1959,10 +1958,10 @@ mod tests {
     fn rebuilds_sleep_item_from_persisted_completion() {
         let turn_id = "turn-1";
         let thread_id = ThreadId::new();
-        let sleep_item = CoreTurnItem::Sleep(CoreSleepItem {
+        let sleep_item = CoreTurnItem::Extension(CoreExtensionItem::Sleep(CoreSleepItem {
             id: "sleep-1".to_string(),
             duration_ms: 1_000,
-        });
+        }));
         let events = vec![
             EventMsg::TurnStarted(TurnStartedEvent {
                 turn_id: turn_id.to_string(),
@@ -1997,10 +1996,10 @@ mod tests {
         assert_eq!(turns.len(), 1);
         assert_eq!(
             turns[0].items,
-            vec![ThreadItem::Sleep {
+            vec![ThreadItem::Sleep(CoreSleepItem {
                 id: "sleep-1".to_string(),
                 duration_ms: 1_000,
-            }]
+            })]
         );
     }
 

codex-rs/app-server-protocol/src/protocol/v2/item.rs

@@ -14,6 +14,7 @@ use crate::protocol::item_builders::review_output_text;
 use codex_experimental_api_macros::ExperimentalApi;
 use codex_extension_items::ExtensionItem;
 pub use codex_extension_items::image_generation::ImageGenerationItem;
+pub use codex_extension_items::sleep::SleepItem;
 pub use codex_extension_items::web_search::WebSearchAction;
 pub use codex_extension_items::web_search::WebSearchItem;
 use codex_protocol::approvals::GuardianAssessmentAction as CoreGuardianAssessmentAction;
@@ -368,13 +369,7 @@ pub enum ThreadItem {
         id: String,
         path: LegacyAppPathString,
     },
-    #[serde(rename_all = "camelCase")]
-    #[ts(rename_all = "camelCase")]
-    Sleep {
-        id: String,
-        #[ts(type = "number")]
-        duration_ms: u64,
-    },
+    Sleep(SleepItem),
     ImageGeneration(ImageGenerationItem),
     #[serde(rename_all = "camelCase")]
     #[ts(rename_all = "camelCase")]
@@ -430,11 +425,11 @@ impl ThreadItem {
             | ThreadItem::CollabAgentToolCall { id, .. }
             | ThreadItem::SubAgentActivity { id, .. }
             | ThreadItem::ImageView { id, .. }
-            | ThreadItem::Sleep { id, .. }
             | ThreadItem::EnteredReviewMode { id, .. }
             | ThreadItem::ExitedReviewMode { id, .. }
             | ThreadItem::ContextCompaction { id, .. } => id,
             ThreadItem::WebSearch(item) => &item.id,
+            ThreadItem::Sleep(item) => &item.id,
             ThreadItem::ImageGeneration(item) => &item.id,
         }
     }
@@ -908,12 +903,9 @@ impl From<CoreTurnItem> for ThreadItem {
                 id: image.id,
                 path: image.path.into(),
             },
-            CoreTurnItem::Sleep(sleep) => ThreadItem::Sleep {
-                id: sleep.id,
-                duration_ms: sleep.duration_ms,
-            },
             CoreTurnItem::Extension(extension) => match extension {
                 ExtensionItem::ImageGeneration(item) => ThreadItem::ImageGeneration(item),
+                ExtensionItem::Sleep(item) => ThreadItem::Sleep(item),
                 ExtensionItem::WebSearch(item) => ThreadItem::WebSearch(item),
             },
             CoreTurnItem::ImageGeneration(image) => {