feat: add OpenSpec specs and changes for ASW restructure

Specs: repo-structure, 10 framework layer specs, packs, site.
Changes: repo-restructure (10 tasks), css-refactor (12 tasks),
legacy-import (proposal + triage categories).

Supersede docs/css-refactor-plan.md in favor of OpenSpec change.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

openspec/specs/framework/charts/spec.md

@@ -0,0 +1,32 @@
+# Spec: Charts (Layer 09)
+
+File: `src/layers/09-charts.css`
+
+## Purpose
+
+Data visualization using pure CSS and HTML tables. Inspired by Charts.css — uses `data-*` attributes to transform tables into visual charts.
+
+## Scope
+
+### In scope
+- Bar charts (horizontal and vertical)
+- Line charts
+- Area charts
+- Radial/gauge charts
+- Chart axes, labels, legends
+- Responsive chart sizing
+- Chart color schemes using design tokens
+
+### Out of scope
+- JavaScript-powered charts
+- Interactive chart features (tooltips on hover are CSS-only)
+
+## Lineage
+
+Inspired by Charts.css `data-*` attribute pattern. Not a port — reimplemented for ASW's token system and semantic approach.
+
+## Constraints
+
+- References only semantic aliases from `01-tokens.css`
+- Charts must be readable without CSS (the underlying table has the data)
+- Color choices must work for colorblind users