Session Event Emission And Monitoring Hooks

MCP session management for Metorial. Provides session handling and tool lifecycle management for Model Context Protocol.

Unique: Provides session-level event emission at all lifecycle points, enabling external systems to observe and react to session state changes without coupling to session internals. Events include rich metadata (timestamps, durations, error details, context) for observability.

vs others: More comprehensive than basic logging because it provides structured events at all lifecycle points and enables integration with external observability platforms, whereas logging alone requires parsing text output.