/**
 * Data Migration — Consolidate scattered data dirs into .data/
 *
 * Runs once on first startup after upgrading to the .data/ layout.
 * Uses sentinel file (.data/.migrated) to skip on subsequent runs.
 *
 * Migration map:
 *   state/{photon}/{instance}.json   → .data/{ns}/{photon}/state/{instance}/state.json
 *   state/{photon}/{instance}.log    → .data/{ns}/{photon}/state/{instance}/state.log
 *   context/{photon}.json            → .data/{ns}/{photon}/context.json
 *   env/{photon}.json                → .data/{ns}/{photon}/env.json
 *   data/{photon}/*.json             → .data/{ns}/{photon}/memory/*.json
 *   data/_global/                    → .data/_global/
 *   sessions/                        → .data/_sessions/
 *   logs/{photon}/                   → .data/{ns}/{photon}/logs/
 *   .cache/ + cache/                 → .data/.cache/
 *   tasks/                           → .data/tasks/
 *   audit.jsonl                      → .data/audit.jsonl
 *   .metadata.json                   → .data/.metadata.json
 *   daemon.sock / .pid / .log        → .data/daemon.*
 */
/**
 * Run the .data/ migration if it hasn't been run yet.
 * Safe to call on every startup — returns immediately if already migrated.
 */
export declare function runDataMigration(baseDir?: string): Promise<void>;
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