feat: emit events around collab tools (#9095)

Emit the following events around the collab tools. On the `app-server`
this will be under `item/started` and `item/completed`
```
#[derive(Debug, Clone, Deserialize, Serialize, PartialEq, JsonSchema, TS)]
pub struct CollabAgentSpawnBeginEvent {
    /// Identifier for the collab tool call.
    pub call_id: String,
    /// Thread ID of the sender.
    pub sender_thread_id: ThreadId,
    /// Initial prompt sent to the agent. Can be empty to prevent CoT leaking at the
    /// beginning.
    pub prompt: String,
}

#[derive(Debug, Clone, Deserialize, Serialize, PartialEq, JsonSchema, TS)]
pub struct CollabAgentSpawnEndEvent {
    /// Identifier for the collab tool call.
    pub call_id: String,
    /// Thread ID of the sender.
    pub sender_thread_id: ThreadId,
    /// Thread ID of the newly spawned agent, if it was created.
    pub new_thread_id: Option<ThreadId>,
    /// Initial prompt sent to the agent. Can be empty to prevent CoT leaking at the
    /// beginning.
    pub prompt: String,
    /// Last known status of the new agent reported to the sender agent.
    pub status: AgentStatus,
}

#[derive(Debug, Clone, Deserialize, Serialize, PartialEq, JsonSchema, TS)]
pub struct CollabAgentInteractionBeginEvent {
    /// Identifier for the collab tool call.
    pub call_id: String,
    /// Thread ID of the sender.
    pub sender_thread_id: ThreadId,
    /// Thread ID of the receiver.
    pub receiver_thread_id: ThreadId,
    /// Prompt sent from the sender to the receiver. Can be empty to prevent CoT
    /// leaking at the beginning.
    pub prompt: String,
}

#[derive(Debug, Clone, Deserialize, Serialize, PartialEq, JsonSchema, TS)]
pub struct CollabAgentInteractionEndEvent {
    /// Identifier for the collab tool call.
    pub call_id: String,
    /// Thread ID of the sender.
    pub sender_thread_id: ThreadId,
    /// Thread ID of the receiver.
    pub receiver_thread_id: ThreadId,
    /// Prompt sent from the sender to the receiver. Can be empty to prevent CoT
    /// leaking at the beginning.
    pub prompt: String,
    /// Last known status of the receiver agent reported to the sender agent.
    pub status: AgentStatus,
}

#[derive(Debug, Clone, Deserialize, Serialize, PartialEq, JsonSchema, TS)]
pub struct CollabWaitingBeginEvent {
    /// Thread ID of the sender.
    pub sender_thread_id: ThreadId,
    /// Thread ID of the receiver.
    pub receiver_thread_id: ThreadId,
    /// ID of the waiting call.
    pub call_id: String,
}

#[derive(Debug, Clone, Deserialize, Serialize, PartialEq, JsonSchema, TS)]
pub struct CollabWaitingEndEvent {
    /// Thread ID of the sender.
    pub sender_thread_id: ThreadId,
    /// Thread ID of the receiver.
    pub receiver_thread_id: ThreadId,
    /// ID of the waiting call.
    pub call_id: String,
    /// Last known status of the receiver agent reported to the sender agent.
    pub status: AgentStatus,
}

#[derive(Debug, Clone, Deserialize, Serialize, PartialEq, JsonSchema, TS)]
pub struct CollabCloseBeginEvent {
    /// Identifier for the collab tool call.
    pub call_id: String,
    /// Thread ID of the sender.
    pub sender_thread_id: ThreadId,
    /// Thread ID of the receiver.
    pub receiver_thread_id: ThreadId,
}

#[derive(Debug, Clone, Deserialize, Serialize, PartialEq, JsonSchema, TS)]
pub struct CollabCloseEndEvent {
    /// Identifier for the collab tool call.
    pub call_id: String,
    /// Thread ID of the sender.
    pub sender_thread_id: ThreadId,
    /// Thread ID of the receiver.
    pub receiver_thread_id: ThreadId,
    /// Last known status of the receiver agent reported to the sender agent before
    /// the close.
    pub status: AgentStatus,
}
```

codex-rs/mcp-server/src/codex_tool_runner.rs

@@ -349,6 +349,14 @@ async fn run_codex_tool_session_inner(
                     | EventMsg::ExitedReviewMode(_)
                     | EventMsg::ContextCompacted(_)
                     | EventMsg::ThreadRolledBack(_)
+                    | EventMsg::CollabAgentSpawnBegin(_)
+                    | EventMsg::CollabAgentSpawnEnd(_)
+                    | EventMsg::CollabAgentInteractionBegin(_)
+                    | EventMsg::CollabAgentInteractionEnd(_)
+                    | EventMsg::CollabWaitingBegin(_)
+                    | EventMsg::CollabWaitingEnd(_)
+                    | EventMsg::CollabCloseBegin(_)
+                    | EventMsg::CollabCloseEnd(_)
                     | EventMsg::DeprecationNotice(_) => {
                         // For now, we do not do anything extra for these
                         // events. Note that