pi-utils-settings v0.19.0

09a5603: - Versioned migrations: Migration.version (monotonic int) auto-stamps the config file; shouldRun defaults to a version comparison; run/shouldRun/message factory receive a MigrationContext with applied-migration history. ConfigLoader.getVersion() reads the stamped version.
- Ctrl+S now saves from within nested submenus (ArrayEditor, SettingsDetailEditor, FuzzySelector, etc.); new requestSave option on submenu/component options for standalone use.
- createConfigStore(loader, { scopes }) helper replaces hand-written ConfigStore wrappers.
- pi-settings-schema CLI wraps ts-json-schema-generator, auto-injects $schema + version, and supports --check. Also exported programmatically as finalizeSchema/generateSettingsSchema. ts-json-schema-generator is now an optional peerDependency.