U-API

• Added lifecycle-scoped public service discovery without dependencies on consuming mods.
• Added neutral social-group, ready-check, permission and bounded public-profile-facet contracts.
• Added protocol negotiation, request correlation, bounded rate limiting and connection request tracking.
• Added a retained client UI runtime with layouts, themes, focus, reusable controls, virtualization, modal/toast primitives and deterministic cleanup.
• Unified first-party screens on the Soul-inspired ARCANE theme and fixed render ordering so vanilla blur cannot be applied over completed retained UI.
• Added collision-aware HUD registration and bounded, interpolated, privacy-neutral world overlays.
• Added bounded player-head caching and client connection cleanup.
• Expanded opt-in diagnostics for services, UI, HUD, overlays, caches and packet rates.
• Added common/server configuration for optional integrations, debug logging and network bounds.
• Made 2.0 a breaking clean-install line: removed the migration API, required exact current versions for instance storage/sidebar JSON and dropped source-compatibility promises for 1.x.

Compatibility

• Minecraft: 1.21.1
• Loader: NeoForge
• Java: 21