import type { Subprocess } from "bun";
/** Minimum time between background runs. Sessions qualify only after days idle, so daily is enough. */
export declare const GC_AUTO_COMPRESS_INTERVAL_MS: number;
/** Output of the latest background run, under the agent dir. */
export declare const GC_AUTO_COMPRESS_LOG = "gc-auto-compress.log";
/**
 * Start a detached `omp gc --compress --apply` for `agentDir` when the last
 * background run is at least a day old and the sessions directory sits on a
 * volume with transparent compression (APFS, NTFS). Returns the child, or
 * undefined when no run was due or possible, or another launch is claiming it.
 * The child outlives this process.
 */
export declare function scheduleGcAutoCompress(agentDir: string): Promise<Subprocess | undefined>;