- Add Architecture intro page explaining the spec's two-layer design
(core language + selectable adapters) with dependency graph
- Split specs into Core (parser, eval, primitives, render) and
Adapters (DOM, HTML, SX wire, SxEngine) overview pages
- Add individual detail pages for all adapter and engine specs
- Update nav with Architecture landing, Core, Adapters, and all
individual spec file links
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
giles
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