fix: Remove backup auth check from new session (#544)

This was an optimistic check, and causes issues when users are using
alternate logins. Just removing

Author: benbrandt

src/acp-agent.ts

@@ -61,7 +61,6 @@ import {
 import { ContentBlockParam } from "@anthropic-ai/sdk/resources";
 import { BetaContentBlock, BetaRawContentBlockDelta } from "@anthropic-ai/sdk/resources/beta.mjs";
 import { randomUUID } from "node:crypto";
-import * as fs from "node:fs";
 import * as os from "node:os";
 import * as path from "node:path";
 import packageJson from "../package.json" with { type: "json" };
@@ -452,14 +451,6 @@ export class ClaudeAcpAgent implements Agent {
   }
 
   async newSession(params: NewSessionRequest): Promise<NewSessionResponse> {
-    if (
-      !this.gatewayAuthMeta &&
-      fs.existsSync(path.resolve(os.homedir(), ".claude.json.backup")) &&
-      !fs.existsSync(path.resolve(os.homedir(), ".claude.json"))
-    ) {
-      throw RequestError.authRequired();
-    }
-
     const response = await this.createSession(params, {
       // Revisit these meta values once we support resume
       resume: (params._meta as NewSessionMeta | undefined)?.claudeCode?.options?.resume,