/**
 * TOC integration ask③ (INTEGRATION-DESIGN §11) — boot-time orphan-run reclaim, extracted from main()'s boot
 * sequence so the env-only/no-backend path (runStore undefined) is UNIT-TESTABLE.
 *
 * Why a helper: the original inline version did `(runStore as {...}).reclaimOrphanedAtBoot` and a bare
 * `typeof reclaimable.reclaimOrphanedAtBoot === "function"` — which is a MEMBER ACCESS on `undefined` when runStore is
 * absent (the default env-only deploy: SESSION_BACKEND=memory, no DB → backend undefined → runStore undefined).
 * `typeof x.y` does NOT guard against `x` being undefined (only a bare `typeof y` does), so it threw a TypeError at
 * boot on that lane. A workflow 2nd-pass re-review caught it (HIGH regression from 1.49.0); the 6-dim review + the full
 * suite missed it because they exercised FileRunStore.reclaimOrphanedAtBoot DIRECTLY, never the env-only main() boot.
 */
/** The host/file lane's optional orphan-reclaim capability (only FileRunStore implements it). */
export interface ReclaimableRunStore {
    reclaimOrphanedAtBoot?: (isResumable?: (sessionId: string) => Promise<boolean>) => Promise<number>;
}
/** A checkpoint store just enough to answer "is this session a resume-in-progress?" (pending checkpoint). */
export interface ReclaimCheckpointProbe {
    findPendingTokenBySession: (sessionId: string) => Promise<unknown>;
}
/**
 * Reclaim runs orphaned by a previous host-lane engine process (flip orphaned `running` → failed + release their
 * `active/<sessionId>` claims, so a re-submit isn't EEXIST-blocked). NULL-SAFE: a no-op (returns 0) when runStore is
 * absent or doesn't implement the capability (env-only / cross-replica tidb-pg lane). `checkpointStore`, when present,
 * EXCLUDES resume-in-progress (markResuming) sessions from reclaim so a resumable session is never stranded.
 */
export declare function reclaimOrphansAtBoot(runStore: unknown, checkpointStore: ReclaimCheckpointProbe | undefined, logger?: {
    info: (msg: string, data: Record<string, unknown>) => void;
}): Promise<number>;
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