/**
 * Recursively strip internal metadata from API responses.
 * Used by Knowledge Graph toolsets to keep response payloads clean.
 *
 * Contract:
 *  - Drops null/undefined/empty-string values and `columnMappingMeta` keys.
 *  - Preserves explicitly-empty collections (e.g. `{relationship_types: []}`)
 *    so callers can distinguish "no related types" from a missing field.
 *  - Prunes metadata-only array rows: a row that becomes `{}` after stripping
 *    (e.g. `{columnMappingMeta: {...}}`) is removed rather than left as a
 *    `{}` placeholder, so `{fields: [{columnMappingMeta: {...}}]}` cleans to
 *    `{fields: []}` instead of `{fields: [{}]}`.
 */
export declare function stripInternalMeta(obj: unknown): unknown;
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