feat(adapter): detect claude-login-required errors and expose errorCode/errorMeta

Add detectClaudeLoginRequired and extractClaudeLoginUrl to parse module.
Extract buildClaudeRuntimeConfig for reuse by both execute and the new
runClaudeLogin helper. Include errorCode: "claude_auth_required" and
errorMeta: { loginUrl } in execution results when login is needed.
Export runClaudeLogin from the package index.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/adapter-utils/src/types.ts

@@ -35,6 +35,8 @@ export interface AdapterExecutionResult {
   signal: string | null;
   timedOut: boolean;
   errorMessage?: string | null;
+  errorCode?: string | null;
+  errorMeta?: Record<string, unknown>;
   usage?: UsageSummary;
   /**
    * Legacy single session id output. Prefer `sessionParams` + `sessionDisplayId`.