import type { GroupProfileSnapshot } from '../../types/index.js';
/**
 * Auto-enable/disable tool groups based on the project's detected stack.
 *
 * Returns a snapshot of which groups were actually activated/deactivated,
 * or null if the GroupManager singleton is not initialized (e.g. tests,
 * early startup). Never throws — best-effort.
 */
export declare function applyStackBasedGroupActivations(detectedStack: readonly string[]): GroupProfileSnapshot | null;
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