Refactor to use Rhai packages for efficient engine creation

- Created OsirisPackage with all OSIRIS types and functions registered in the package
- Functions now registered directly in package module (Note, Event, get_context)
- Created ZdfzPackage extending OsirisPackage
- Engine factory pattern: creates Engine::new_raw() + registers package (very cheap)
- Removed TypeRegistry (unused code)
- Simplified runner to use factory functions instead of passing packages
- Package is created once, then factory efficiently creates engines on demand

src/lib.rs

@@ -8,14 +8,21 @@ pub mod interfaces;
 pub mod objects;
 pub mod retrieve;
 pub mod store;
-pub mod rhai;
+
+// Rhai integration modules (top-level)
+pub mod context;
+pub mod engine;
 
 pub use error::{Error, Result};
 pub use store::{BaseData, IndexKey, Object, Storable};
 pub use objects::{Event, Note};
 
 // OsirisContext is the main type for Rhai integration
-pub use rhai::{OsirisContext, OsirisInstance};
+pub use context::{OsirisContext, OsirisInstance, OsirisContextBuilder};
+pub use engine::{
+    create_osiris_engine,
+    OsirisPackage,
+};
 
 // Re-export the derive macro
 pub use osiris_derive::Object as DeriveObject;