- Context dataclasses now expose documented_fields(), returning
ContextField(name, type_name, help) for each field
- ExtraRegistry.internal_classes_for_scope() returns the Extra classes
that are available to HTML templates but excluded from JSON
- Tests enforce that every registered Extra has a description and every
DatabaseContext/QueryContext field has help metadata
Refs #1510, #2127
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
