v0.1.2

Added\n- Root-level SubmodelElement creation helpers\n- Canonical serialization for booleans, datetimes, bytes, and enums\n- Configurable encoding toggles for Discovery assetIds and AASX package IDs\n- Expanded unit coverage for edge cases and async helpers\n- GHCR Docker image publishing workflow\n\n### Fixed\n- Update endpoints now refetch on 204 No Content responses\n- Examples aligned with Docker compose base URLs