add_to_diagram

Add nodes or node types to a diagram with auto-grid layout. For model diagrams use node IDs or auto-IDs (e.g. REQ-1); for metamodel diagrams use node type IDs. Applied immediately.

{"diagram": "System Overview", "node_ids": ["uuid-1", "uuid-2", "REQ-3"]}

{"success": true, "operation_count": 3, "versions": [65, 66, 67]}