LPG Modeler: One YAML File, Four Graph Schemas

Field notes

The project keeps semantic schema data in a reviewable YAML file while storing diagram coordinates separately, so moving boxes does not create a semantic diff. Its documented targets cover LadybugDB, Neo4j, SHACL, and OWL, with unsupported constraints surfaced in warnings and generated-file comments rather than discarded. A CLI is presented as running the same validation and generation checks in continuous integration, and the site includes a social-domain example with inheritance, mixins, keys, and property-bearing edges.