Fix LinkML schema for valid RDF generation with proper slot_uri
Summary:
- Create 46 missing slot definition files with proper slot_uri values
- Add slot imports to main schema (01_custodian_name_modular.yaml)
- Fix YAML examples sections in 116+ class and slot files
- Fix PersonObservation.yaml examples section (nested objects → string literals)
Technical changes:
- All slots now have explicit slot_uri mapping to base ontologies (RiC-O, Schema.org, SKOS)
- Eliminates malformed URIs like 'custodian/:slot_name' in generated RDF
- gen-owl now produces valid Turtle with 153,166 triples
New slot files (46):
- RiC-O slots: rico_note, rico_organizational_principle, rico_has_or_had_holder, etc.
- Scope slots: scope_includes, scope_excludes, archive_scope
- Organization slots: organization_type, governance_authority, area_served
- Platform slots: platform_type_category, portal_type_category
- Social media slots: social_media_platform_category, post_type_*
- Type hierarchy slots: broader_type, narrower_types, custodian_type_broader
- Wikidata slots: wikidata_equivalent, wikidata_mapping
Generated output:
- schemas/20251121/rdf/01_custodian_name_modular_20260107_134534_clean.owl.ttl (6.9MB)
- Validated with rdflib: 153,166 triples, no malformed URIs
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