/**
 * Namespace Migration
 *
 * Migrates flat ~/.photon/*.photon.ts files into namespace subdirectories.
 * Also cleans up legacy ~/.photon/local/ artifacts from older auto-symlink logic.
 *
 * Files with @forkedFrom metadata → move to author namespace
 * Files without metadata → stay in root (local photons live at ~/.photon/ root)
 *
 * Runs once on first startup, writes .migrated sentinel to prevent re-runs.
 */
/**
 * Run the namespace migration if it hasn't been run yet.
 * Safe to call on every startup — returns immediately if already migrated.
 *
 * Only runs on the real ~/.photon directory (not custom PHOTON_DIR overrides
 * which may be test fixture directories).
 */
export declare function runNamespaceMigration(baseDir?: string): Promise<void>;
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