dea-scripts: RDFLib TTL validation against metamodel

[emmanuel-a-otchere]

WBS: DT-S-002 | Developer Tooling

Phase: Code | Layer: L2 — Tooling | Priority: Medium

Objective

Build a script that validates catalog TTL files against the metamodel ontology.

Deliverables

• dea_validate_ttl --metamodel dea-metamodel.ttl --catalog catalog.ttl
• Reports: missing entity types, invalid relationships, orphaned nodes
• Exit code: 0 = pass, 1 = fail
• Used in GitHub Actions CI