Restructure core modules into subpackages (generator, schematic, config, session, etc.); add .schem/.nbt schematic pipeline, commands, adaptive stats skeleton, and bootstrap wiring.
- Created LocaleLoader.java - disk loading and validation - Created LocaleCache.java - thread-safe storage - Locales.java now acts as facade - Clean separation: loading → caching → access - All tests pass, build successful Wave 2/8 complete (260 lines → 3 files)
