refactor(Track): consolidate command dispatchers and enhance error handling

- Remove standalone `notificatons.rs` and integrate its logic directly into `track.rs` as part of Mountain's core command routing system
- Implement centralized error utilities (`error_utils`) for structured JSON error responses across frontend and extension host communications
- Streamline effect creation patterns with generic wrappers for common return types (u32 handles, void operations)
- Expand language feature registration coverage with 20+ provider types mapped to effect-based implementations
- Improve RPC method routing with explicit fallback handling for unprocessed methods
- Add parametric type checking and error context propagation for extension host requests
- Normalize terminal API handling between direct notifications and RPC-style commands

This refactoring reduces architectural fragmentation in the command dispatch system while improving maintainability and error reporting capabilities for both user-facing operations and extension host communications. The changes directly support Cocoon's extension shim requirements by ensuring consistent parameter validation and error formatting.

Author: NikolaRHristov

Source/Library.rs

@@ -51,3 +51,5 @@ pub mod handlers {
 pub mod Entry;
 
 pub mod mist;
+
+pub mod track;