/**
 * legacy-import — read-only compatibility layer (G-026 M1, ADR-0004 #17).
 *
 * Old layouts used:
 *   tasks/tasks.jsonl                       (task rows with status/retry_count)
 *   tasks/<task-id>/evidence/done.signal    (done marker)
 *   tasks/<task-id>/evidence/summary.md     (summary)
 *
 * Legacy-import generates attempt metadata with:
 *   producer       = "legacy-import"
 *   trustLevel     = "compatibility"
 *   needsVerification = true
 *
 * Legacy done.signal / summary / retry_count are NEVER promoted to trusted
 * `passed`. Archive changes stay read-only — import only reads, never writes
 * legacy files.
 */
import { type TaskRuntimeLayout } from "./file-layout.js";
export interface LegacyTaskRow {
    id: string;
    title?: string;
    status?: string;
    retry_count?: number;
    [k: string]: unknown;
}
export interface LegacyImportResult {
    changeId: string;
    kind: "new" | "legacy" | "mixed" | "absent";
    tasksImported: number;
    attempted: boolean;
    /** Set only when import is not applicable (absent/archive etc.). */
    reason?: string;
}
/**
 * Import legacy tasks into attempt metadata (read-only on legacy side).
 * For each task row in tasks.jsonl we create a single synthetic attempt
 * carrying compatibility trust.
 */
export declare function legacyImport(layout: TaskRuntimeLayout, opts?: {
    changeId?: string;
    skipTaskIds?: Set<string>;
}): Promise<LegacyImportResult>;
export declare function readLegacyTasksJsonl(layout: TaskRuntimeLayout): Promise<LegacyTaskRow[]>;
/**
 * Persist a legacy done.signal view into an attempt's done.signal? NO — legacy
 * markers stay legacy. We only surface them for observability via the snapshot's
 * task status derivation in runtime-store (from events). Nothing here writes
 * legacy files.
 */
export declare function legacyDoneSignals(layout: TaskRuntimeLayout): Promise<Record<string, boolean>>;