/**
 * Shared blackboard for sub-agent coordination + automatic maintenance.
 *
 * Sub-agents cannot message each other live (platform limitation), so
 * TeamMode uses a file blackboard under
 * `<repo>/.git/opencode-team/<session-key>/<task>/`:
 *  - <session-key> is a compact timestamp folder, one per conversation —
 *    a fresh conversation can never collide with a not-yet-swept board
 *    from an earlier one;
 *  - each agent writes its full deliverable to a designated file;
 *  - the team lead relays summaries + file paths in every dispatch;
 *  - nobody deletes task directories by hand; the sweeper below reclaims
 *    them once idle past the TTL (sole cleanup path, by design).
 *
 * This module is the code-level reclamation path, independent of the model:
 * a sweeper removes task directories whose last activity is older than
 * the TTL, at plugin startup and hourly in-process.  Placing the board
 * inside `.git/` guarantees the user's working tree and commits are never
 * polluted; for non-git workspaces we fall back to the OS temp dir.
 *
 * TTL is user-configurable via plugin options:
 *   "plugin": [["@te-river/opencode-team-mode", { "ttlDays": 7 }]]
 * Default: 5 days.
 */
/** Default idle time before a task directory is swept: 5 days. */
export declare const DEFAULT_TTL_DAYS = 5;
export declare const DEFAULT_TTL_MS: number;
/** Walk upward from `start` to find the git repository root, if any. */
export declare function findRepoRoot(start: string): string | null;
/** Absolute blackboard root for a workspace. */
export declare function teamRootFor(directory: string): string;
/**
 * Resolve the TTL from plugin options.  Accepts `ttlDays` (or the more
 * explicit `blackboardTtlDays`) as a finite number in (0, 365]; anything
 * else silently falls back to the 5-day default.
 */
export declare function resolveTtlMs(options?: Record<string, unknown>): number;
/**
 * Remove idle boards under `root`.  Understands both layouts:
 *  - session-partitioned `<root>/<session-key>/<task>/`: stale tasks are
 *    pruned individually under a live session; an entirely idle session
 *    folder goes as a whole;
 *  - legacy flat `<root>/<task>/`: unchanged semantics — and if such a dir
 *    unexpectedly contains sub-directories, idle ones are pruned by the
 *    same rule (harmless hygiene, though counted as task dirs).
 * Returns the number of task directories reclaimed; a wholesale session
 * removal counts its task dirs (min 1, so a ghost empty stale session dir
 * also counts 1).  Never throws.
 */
export declare function sweepStale(root: string, ttlMs?: number): number;
/**
 * Start blackboard maintenance (idempotent within the process) and return
 * the resolved board root.  Runs a startup sweep (catches leftovers from
 * crashes / force-kills) plus an unref'd hourly interval so the timer never
 * keeps the process alive on its own.
 */
export declare function startBlackboardMaintenance(directory: string, ttlMs?: number): string;
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