refactor(schema): centralize slot definitions per Rule 38
- Remove slot_uri, description, mappings from slot_usage sections
- Move these properties to centralized slot files in modules/slots/
- Keep only class-specific overrides in slot_usage (required, inlined, examples)
- Update 1,499 centralized slot files with enriched definitions
- Clean 188 class files
Violations fixed:
- slot_uri in slot_usage: 1,676 → 0
- description in slot_usage: 2,287 → 0 (moved to centralized)
Schema still validates: 816 classes, 2028 slots, 127 enums
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