Add new LinkML schema modules for specificity and Wikidata alignment
New classes:
- SpecificityAnnotation: Track class relevance scores per template
- TemplateSpecificityScores: 10 conversation template scores
- WikidataAlignment: Link classes to Wikidata entities
- DualClassLink: Model dual-aspect class relationships
New enums:
- WikidataMappingTypeEnum: exact/close/narrow/broad/related mappings
- DualClassPatternEnum: place-custodian, collection-custodian patterns
New slots (44 files):
- Specificity slots: score, rationale, agent, timestamp
- Template scores: archive_search, museum_search, library_search, etc.
- Wikidata slots: entity_id, label, mapping_type, rationale
- Multilingual labels: label_nl, label_de, label_fr, label_es, etc.
- Custodian type annotations: custodian_types, rationale, primary
- SKOS hierarchy: skos_broader, skos_narrower, skos_related
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