notifications

Bidirectional notification interfaces These interfaces provide convenience functions for sending MCP notifications over output streams. Notifications are one-way messages that don't expect responses. There are two categories: - **Bidirectional notifications**: Shared by client and server (progress) - **Client notifications**: Server → Client only (logs, list changes, requests) Bidirectional MCP notifications Notifications that can be sent by both clients and servers. Currently this includes only progress notifications, which provide real-time updates on long-running operations.