Remove send_notification_sync() method, notification queue, and background flusher task. Component add/remove operations happen outside sessions and no longer need notifications.
Rename Visibility to Enabled, collapse VisibilityRule into the transform,
and move enabled filtering from Provider to Server level so server-level
transforms can override provider-level disables.
Implements comprehensive notification system for tools, resources, and prompts with automatic client updates and flexible message handlers.
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Co-Authored-By: Claude <noreply@anthropic.com>