/**
 * Stable device identifier — persisted UUIDv4 keyed to the CLEO home directory.
 *
 * Used by providers that enforce device-ID stability on every request
 * (`X-Msh-Device-Id` for Kimi Code; future GitHub Copilot / Cursor). The UUID
 * is written once at first use and reused across processes — losing it would
 * trigger device re-registration prompts upstream.
 *
 * Storage: `${CLEO_HOME}/device-id` — single-line UUIDv4, no metadata. Path
 * resolves through `getCleoHome()` so it follows XDG conventions on Linux
 * and stays inside the CLEO home on Windows/macOS.
 *
 * @module llm/stable-device-id
 * @task T9321
 * @epic T9261 T-LLM-CRED-CENTRALIZATION
 */
/**
 * Return the stable device UUID for this CLEO installation.
 *
 * Creates the file on first call (atomic write — tmp+rename pattern). All
 * subsequent calls in the same process return the cached value. Across
 * processes, the file is the source of truth.
 *
 * The UUID is OPAQUE — callers MUST treat it as a stable identifier and not
 * encode any meaning into its bytes.
 *
 * @returns A UUIDv4 string in canonical hyphenated form.
 *
 * @task T9321
 */
export declare function getStableDeviceId(): string;
/**
 * Reset the in-memory cache. Test-only — production code never calls this.
 *
 * @internal
 */
export declare function _resetDeviceIdCacheForTests(): void;
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