[codex] Add interruptible sleep tool (#28429)

## 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`

codex-rs/analytics/src/reducer.rs

@@ -384,6 +384,7 @@ impl TurnToolCounts {
             | ThreadItem::Plan { .. }
             | ThreadItem::Reasoning { .. }
             | ThreadItem::ImageView { .. }
+            | ThreadItem::Sleep { .. }
             | ThreadItem::EnteredReviewMode { .. }
             | ThreadItem::ExitedReviewMode { .. }
             | ThreadItem::ContextCompaction { .. } => return,
@@ -1620,6 +1621,7 @@ fn tracked_tool_item_id(item: &ThreadItem) -> Option<&str> {
         | ThreadItem::Reasoning { .. }
         | ThreadItem::SubAgentActivity { .. }
         | ThreadItem::ImageView { .. }
+        | ThreadItem::Sleep { .. }
         | ThreadItem::EnteredReviewMode { .. }
         | ThreadItem::ExitedReviewMode { .. }
         | ThreadItem::ContextCompaction { .. } => None,