/**
 * Graph's historical-version endpoints template `{version-id}` as a string
 * that must look like a stringified float (`"79.0"`, `"4.0"`). An LLM
 * (reasonably) types `79`, and Graph's response is wildly inconsistent
 * across the three internal pipelines that the consolidated
 * `download-drive-item-version` command dispatches to:
 *
 *   - --format original  → `invalidRequest`
 *   - --format markdown  → `invalidRequest`
 *   - --format pdf       → accepts (Graph quirk)
 *
 * Audit round-6 §1.4 caught the inconsistency. Normalize at the CLI
 * boundary: a pure-integer version-id gets `.0` appended before path
 * substitution, so all three formats accept both spellings.
 *
 * Already-floated values (`79.0`, `12.5`, `4.1`) and non-numeric values
 * (a bad input the schema will then reject) pass through unchanged.
 */
export declare const normalizeVersionId: (raw: string) => string;