/**
 * Detect whether we're running inside the monorepo workspace.
 * Returns the absolute path to the packages/ directory if found, otherwise null.
 *
 * Single source of truth — replaces identical implementations in:
 * - first-boot-installer.ts
 * - addon-bridge.service.ts
 */
export declare function detectWorkspacePackagesDir(startDir: string): string | null;
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