/**
 * Injection legacy utilities - validation keys and marker version extraction.
 *
 * Kept from the deleted injection-registry.ts for backward compatibility
 * with validation output and legacy marker migration. All active injection
 * logic is now delegated to @cleocode/caamp.
 *
 * @task T4677
 * @epic T4663
 */
/**
 * Validation key names for JSON output.
 * Maps target filenames to JSON-safe key names used in validation results.
 */
export declare const INJECTION_VALIDATION_KEYS: Readonly<Record<string, string>>;
/**
 * Get the validation key for a target filename.
 */
export declare function getValidationKey(target: string): string;
/**
 * Extract the CLEO version from an injection marker string.
 * Returns null if no version is present (current format).
 * Returns the version string for legacy format.
 */
export declare function extractMarkerVersion(markerLine: string): string | null;
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