feat: add vibe-auth authentication module

lib/vibe-auth.d.ts

@@ -0,0 +1,40 @@
+export interface EnsureVibecodrAuthParams {
+  apiBase?: string;
+  configPath?: string;
+  verbose?: boolean;
+  minValidSeconds?: number;
+}
+
+export function ensureVibecodrAuth(
+  params?: EnsureVibecodrAuthParams,
+): Promise<{ token: string; expiresAt: number }>;
+
+export interface RefreshVibecodrTokenParams {
+  configPath?: string;
+  apiBase?: string;
+  verbose?: boolean;
+}
+
+export function refreshVibecodrToken(
+  params?: RefreshVibecodrTokenParams,
+): Promise<{ token: string; expiresAt: number }>;
+
+export function defaultConfigPath(): string;
+
+export function normalizeOrigin(origin: string): string;
+
+export function isLikelyClerkTokenProblem(err: unknown): boolean;
+
+export function getStoredCredentials(params?: {
+  configPath?: string;
+}): {
+  hasCredentials: boolean;
+  expiresAt?: number;
+  isExpired?: boolean;
+  configPath: string;
+};
+
+export function fixWindowsPermissions(
+  filePath: string,
+  options?: { verbose?: boolean },
+): { success: boolean; warning?: string; commandRun?: string };