Correlate code mode tool analytics with model responses (#36729)

## What changed

- Emit dynamic tool-call analytics for code mode `exec` and `wait` calls, including duration and terminal status.
- Associate code-mode cells and their nested tool calls with the originating and subsequent model response IDs.
- Buffer correlated tool events until the next response is known, while flushing pending events when turns, threads, or the analytics queue close.

## Testing

- Add reducer coverage for correlating `exec`, `wait`, and nested tool events across turns.
- Add an app-server test that verifies production analytics include the cell and response IDs for a code-mode `exec` call.

GitOrigin-RevId: 8b34ab59c1ad68ebbd57f9c8a05f19ab04df48a4

codex-rs/analytics/src/client_tests.rs

@@ -145,6 +145,10 @@ fn sample_mcp_tool_call_event(thread_id: &str, plugin_id: Option<&str>) -> Track
                 session_id: format!("session-{thread_id}"),
                 turn_id: "turn-1".to_string(),
                 item_id: format!("item-{thread_id}"),
+                cell_id: None,
+                parent_call_id: None,
+                originating_response_id: None,
+                subsequent_response_id: None,
                 app_server_client: CodexAppServerClientMetadata {
                     product_client_id: "codex_desktop".to_string(),
                     client_name: None,