Add Codex clear and compact slash commands (#541)

* Add Codex clear and compact slash commands

* Stabilize queued thinking event test

* Interrupt active Codex turn before slash commands

cli/src/codex/codexAppServerClient.ts

@@ -13,7 +13,9 @@ import type {
     TurnStartParams,
     TurnStartResponse,
     TurnInterruptParams,
-    TurnInterruptResponse
+    TurnInterruptResponse,
+    ThreadCompactStartParams,
+    ThreadCompactStartResponse
 } from './appServerTypes';
 
 type JsonRpcLiteRequest = {
@@ -173,6 +175,17 @@ export class CodexAppServerClient {
         return response as TurnInterruptResponse;
     }
 
+    async compactThread(
+        params: ThreadCompactStartParams,
+        options?: { signal?: AbortSignal }
+    ): Promise<ThreadCompactStartResponse> {
+        const response = await this.sendRequest('thread/compact/start', params, {
+            signal: options?.signal,
+            timeoutMs: CodexAppServerClient.DEFAULT_TIMEOUT_MS
+        });
+        return response as ThreadCompactStartResponse;
+    }
+
     async disconnect(): Promise<void> {
         if (!this.connected) {
             return;