Section Anatomy Dimension

Summary

Add a section anatomy mapping to rune configs and the identity transform. Runes declare a sections map that associates each structural ref with a standard section role (header, title, description, body, footer, media). The transform emits data-section attributes alongside existing BEM classes, enabling themes to style structural anatomy generically across all runes.

Acceptance Criteria

• RuneConfig in packages/transform/src/types.ts gains sections?: Record<string, 'header' | 'title' | 'description' | 'body' | 'footer' | 'media'>
• Identity transform emits data-section on elements whose ref maps to a section role
• Existing BEM classes and data-name attributes are preserved (additive only)
• All container-level rune configs annotated with sections per SPEC-025 Table 1
• refrakt inspect output shows data-section attributes on structural elements
• Unit tests verify section attribute emission for a sample of runes

Approach

1. Add sections to RuneConfig interface
2. In the engine's applyBemClasses or structure injection code, when a ref matches a key in the sections map, emit data-section with the mapped role value
3. Work through SPEC-025 Table 1 to annotate all rune configs

References

• Universal Theming Dimensions (Universal Theming Dimensions — Section Anatomy, Table 1: Section Anatomy Map)