docs: Document hierarchy + Design Specification skeleton
- Add DOCUMENT HIERARCHY (0d) to MEMORY.md
- 7 levels: SYSTEM > ENGINEERING > DESIGN > PRODUCT > SPEC > GUIDES > CODE
- Conflict resolution: higher document wins
- Add docs/design/LANDVEX_DESIGN_SPECIFICATION.md (v1.0-skeleton, DRAFT)
- 18 chapters with full structure
- Button component as reference spec (states, ARIA, keyboard, touch, animation, AC)
- All other chapters marked as TODO with placeholder tables
- Status: DRAFT — filled progressively, not all at once
Rationale: Establish governance first (Fas 1), fill specification
progressively (Fas 2), automated QA later (Fas 3).
Bernt
125ec6e4d2