/**
 * SharedLedgerStore — file-backed cross-process backing for `OutputLedger` and
 * `ReadWorkspaceCache`, so subagents that genuinely share a conversation (a `fork`, which
 * inherits the parent's full context) don't independently re-read the same files or re-run
 * the same commands the parent already put in that shared context.
 *
 * OFF BY DEFAULT — opt in with `LEMMA_SHARED_LEDGER=1` (or `mcp.sharedLedger: true` in
 * lemma.config.json) AND a `LEMMA_AGENT_TREE_ID` env var identifying the fork tree. Both are
 * required on purpose:
 *
 * - Without a tree id, every process on the machine would share one ledger, and a plain
 *   fresh subagent (no inherited context) would get told a file is "UNCHANGED" or a command
 *   "IDENTICAL" for content it never actually received — suppressing content the model
 *   never saw, which is the one thing these caches must never do.
 * - The tree id scopes sharing to processes an orchestrator has explicitly declared share a
 *   context (i.e. `fork` subagents of the same parent), which is the only case where "another
 *   process already has this" is actually true for THIS process too.
 *
 * TTL is short (30 min): a fork tree is a single task, not a persistent cache.
 */
export declare function isSharedLedgerEnabled(cwd?: string): boolean;
/** Get a shared value for `key` (namespaced), or null if disabled, missing, or expired. */
export declare function getSharedEntry(cwd: string, namespace: "output-ledger" | "read-cache", key: string): string | null;
/** Record a value under `key` (namespaced) for other trees-scoped processes to read. */
export declare function setSharedEntry(cwd: string, namespace: "output-ledger" | "read-cache", key: string, value: string): void;
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