/claim #74

Summary

• add shared Weaviate connection, schema, vector, and metadata helpers
• complete Weaviate export for collections/classes with default and named vector support
• add Weaviate import support with collection creation, property inference, batch upsert, and VDF id preservation
• update the README support matrix and CLI examples to include Weaviate

Verification

• python -m compileall -q src/vdf_io/weaviate_util.py src/vdf_io/export_vdf/weaviate_export.py src/vdf_io/import_vdf/weaviate_import.py
• parser/helper smoke test for Weaviate CLI args, collection naming, vector normalization, property inference, and vector config creation
• fake-client import smoke test covering VDF parquet import, collection creation, batch upsert, and vdf_id metadata preservation
• fake-client export smoke test covering collection iteration, parquet output, vector metadata, and VDF_META.json generation

Notes

• supports Weaviate Cloud URLs, custom endpoints, and local instances
• falls back to WEAVIATE_API_KEY when --api_key is not provided