/**
 * saga.add — link a member Epic to a Saga via `parent_id` containment.
 *
 * After T10638 (E10.W5), Saga membership uses canonical `parent_id`
 * containment rather than `task_relations.type='groups'`. Sagas are
 * identified by `type='saga'` (ADR-083 §2.5), not by label.
 *
 * Validates that:
 *   - the saga task exists and has `type='saga'`
 *   - the epic task exists and has `type='epic'`
 *   - the epic is NOT already parented to another saga (idempotent re-add ok)
 *   - the epic candidate is NOT itself a saga (ADR-073 §1.2 invariant I7)
 *
 * Returns an EngineResult — the dispatch layer wraps it in a LAFS envelope.
 *
 * @task T10124
 * @task T10120
 * @task T10118 — wire I7 enforcement gate
 * @task T10638 — E10.W5 type='saga' + parent_id containment
 * @epic T10208
 * @epic T10209 — E-SAGA-ENFORCEMENT
 * @saga T10538 — SG-PM-CORE-V2
 * @see ADR-073-above-epic-naming.md §1
 * @see ADR-083-saga-as-tasktype.md §2.5
 */
import { type EngineResult } from '../engine-result.js';
/** Input parameters for {@link sagaAdd}. */
export interface SagaAddParams {
    /** Saga task ID (must have `type='saga'`). */
    sagaId: string;
    /** Epic task ID to link (must have `type='epic'`). */
    epicId: string;
}
/** Result payload for {@link sagaAdd}. */
export interface SagaAddResult {
    sagaId: string;
    epicId: string;
    added: boolean;
}
/**
 * Link an Epic into a Saga as a member via `parent_id` containment.
 * Validates saga/epic preconditions per ADR-073 §1 + ADR-083 §2.5.
 *
 * @param projectRoot - Absolute path to the project root.
 * @param params - sagaId + epicId to link.
 */
export declare function sagaAdd(projectRoot: string, params: SagaAddParams): Promise<EngineResult<SagaAddResult>>;
//# sourceMappingURL=add.d.ts.map