Notification Broadcasting To Connected Clients

[Rust MCP SDK](https://github.com/modelcontextprotocol/rust-sdk)

Unique: Implements server-initiated notifications as a first-class protocol feature, allowing the server to push updates to clients without client polling, enabling real-time synchronization of tool and resource availability

vs others: More efficient than polling-based approaches because clients receive updates immediately when server state changes, reducing latency and network overhead in dynamic AI systems