fix: typecheck

Author: NikolaiSviridov

src/CodexACPAgent.ts

@@ -53,7 +53,7 @@ export class CodexACPAgent implements acp.Agent {
 
     private readonly sessions: Map<string, SessionState>;
 
-    constructor(connection: acp.AgentSideConnection, codexConnection: MessageConnection, codexConfig: JsonObject, modelProvider?: string) {
+    constructor(connection: acp.AgentSideConnection, codexConnection: MessageConnection, codexConfig?: JsonObject, modelProvider?: string) {
         this.sessions = new Map();
         this.codexClient = new CodexClient(codexConnection);
         this.connection = connection;