Expose ontology validation and promotion contract for SocioProphet Vue workbench

[mdheller]

Context

SocioSphere capture: SocioProphet/sociosphere#333
UI owner: SocioProphet/socioprophet#323

The rescued platform work describes a domain ontology visualization/editor comparable to Neo4j Bloom + Watson Knowledge Studio + WebProtégé. This issue owns the ontology-side runtime contract and promotion rules, not the Vue UI itself.

Scope

Define backend contract for ontology workbench operations:

• list ontology namespaces and active graphs
• read class/property/relationship trees
• validate proposed class/property edits
• validate relationship additions/removals
• generate promotion candidates
• emit SHACL/OWL/RDF/JSON-LD export bundles where applicable
• return validation diagnostics suitable for UI display
• require capability-gated promotion for canonical ontology changes

Candidate methods

• ontology.namespaces.list
• ontology.graph.get
• ontology.term.search
• ontology.edit.validate
• ontology.relationship.validate
• ontology.promotion.candidate.create
• ontology.promotion.approve
• ontology.export.bundle

Acceptance criteria

• Add contract documentation and fixtures.
• Include positive and negative validation examples.
• Include capability/policy requirements for promotion.
• Link to SocioProphet/socioprophet Vue adapter issue.