/**
 * Reads `.scaffold/state.json` and returns the `save_counter` field.
 * Returns null on any failure (missing file, invalid JSON, missing field).
 *
 * Used by service-scope cache readers (readEligible) to verify that the
 * service's cached next_eligible was written against the current root state
 * (spec §6). Not used at cache WRITE time — StateManager captures the counter
 * internally during loadState to avoid TOCTOU.
 */
export declare function readRootSaveCounter(projectRoot: string): number | null;
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