MCP `notifications/resources/updated` not handled per spec

Summary

Claude Code accepts but silently drops notifications/resources/updated from MCP servers. Per the MCP specification, clients should handle this notification when a subscribed resource changes.

Current behavior

Server sends ResourceUpdatedNotification via stdio transport → client returns no error → notification is silently ignored. The AI session is never informed.

Expected behavior (per MCP spec)

The client should process the notification and make the updated resource available to the AI session.

Environment

• Claude Code: latest (CLI, macOS)
• MCP transport: stdio