Potential fix for pull request finding 'Unused variable, import, function or class'

Co-authored-by: Copilot Autofix powered by AI <223894421+github-code-quality[bot]@users.noreply.github.com>

Author: benbrandt

src/CodexEventHandler.ts

@@ -4,7 +4,6 @@ import type {
     ServerNotification
 } from "./app-server";
 import type {SessionState, ThreadGoalSnapshot} from "./CodexAcpServer";
-import * as acp from "@agentclientprotocol/sdk";
 import {type PlanEntry, RequestError} from "@agentclientprotocol/sdk";
 import {ACPSessionConnection, type AcpClientConnection, type UpdateSessionEvent} from "./ACPSessionConnection";
 import type {