Add resume_agent collab tool (#10903)

Summary
- add the new resume_agent collab tool path through core, protocol, and
the app server API, including the resume events
- update the schema/TypeScript definitions plus docs so resume_agent
appears in generated artifacts and README
- note that resumed agents rehydrate rollout history without overwriting
their base instructions

Testing
- Not run (not requested)

codex-rs/tui/src/chatwidget.rs

@@ -4024,6 +4024,8 @@ impl ChatWidget {
             EventMsg::CollabWaitingEnd(ev) => self.on_collab_event(collab::waiting_end(ev)),
             EventMsg::CollabCloseBegin(_) => {}
             EventMsg::CollabCloseEnd(ev) => self.on_collab_event(collab::close_end(ev)),
+            EventMsg::CollabResumeBegin(ev) => self.on_collab_event(collab::resume_begin(ev)),
+            EventMsg::CollabResumeEnd(ev) => self.on_collab_event(collab::resume_end(ev)),
             EventMsg::ThreadRolledBack(_) => {}
             EventMsg::RawResponseItem(_)
             | EventMsg::ItemStarted(_)

codex-rs/tui/src/collab.rs

@@ -5,6 +5,8 @@ use codex_core::protocol::AgentStatus;
 use codex_core::protocol::CollabAgentInteractionEndEvent;
 use codex_core::protocol::CollabAgentSpawnEndEvent;
 use codex_core::protocol::CollabCloseEndEvent;
+use codex_core::protocol::CollabResumeBeginEvent;
+use codex_core::protocol::CollabResumeEndEvent;
 use codex_core::protocol::CollabWaitingBeginEvent;
 use codex_core::protocol::CollabWaitingEndEvent;
 use codex_protocol::ThreadId;
@@ -97,6 +99,34 @@ pub(crate) fn close_end(ev: CollabCloseEndEvent) -> PlainHistoryCell {
     collab_event("Agent closed", details)
 }
 
+pub(crate) fn resume_begin(ev: CollabResumeBeginEvent) -> PlainHistoryCell {
+    let CollabResumeBeginEvent {
+        call_id,
+        sender_thread_id: _,
+        receiver_thread_id,
+    } = ev;
+    let details = vec![
+        detail_line("call", call_id),
+        detail_line("receiver", receiver_thread_id.to_string()),
+    ];
+    collab_event("Resuming agent", details)
+}
+
+pub(crate) fn resume_end(ev: CollabResumeEndEvent) -> PlainHistoryCell {
+    let CollabResumeEndEvent {
+        call_id,
+        sender_thread_id: _,
+        receiver_thread_id,
+        status,
+    } = ev;
+    let details = vec![
+        detail_line("call", call_id),
+        detail_line("receiver", receiver_thread_id.to_string()),
+        status_line(&status),
+    ];
+    collab_event("Agent resumed", details)
+}
+
 fn collab_event(title: impl Into<String>, details: Vec<Line<'static>>) -> PlainHistoryCell {
     let title = title.into();
     let mut lines: Vec<Line<'static>> =