import { type Occupancy } from './collision.js';
type Gather = (repoRoot: string, opts: {
    integrationRef: string;
}) => Promise<Occupancy[]>;
/**
 * Resolve the next free phase number across local + sibling + upstream claims,
 * or `null` when nothing was observed or any source failed. `null` is the
 * caller's signal to fall back to today's literal `<num>` placeholder — this
 * never throws and never blocks `progress`. The collector is injectable for
 * deterministic, offline tests.
 */
export declare function resolveNextFreePhase(root: string, gather?: Gather): Promise<number | null>;
export {};
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