/**
 * Prompt normalization functions
 */
/**
 * Normalizes a user prompt for signal extraction.
 *
 * Algorithm (per SRS 6.2):
 * 1. Convert to lowercase
 * 2. Remove punctuation except dots in file extensions and slashes in paths
 * 3. Collapse multiple spaces
 * 4. Trim whitespace
 *
 * @param prompt - The raw user prompt
 * @returns Normalized prompt string
 */
export declare function normalizePrompt(prompt: string): string;
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