Implement safe public LSL delivery (#129)

crates/metacrate/src/lib.rs

@@ -0,0 +1,9 @@
+//! Native MetaCrate functionality outside the original LibreMetaverse
+//! compatibility surface.
+//!
+//! Dependency direction is deliberate: this facade may expose MetaCrate
+//! components which consume LibreMetaverse compatibility APIs, while no
+//! `libremetaverse-*` crate may depend on or re-export this facade.
+
+pub use metacrate_grid_agent as grid_agent;
+pub use metacrate_lsl_tools as lsl_tools;