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/data-attributes/spec.md

@@ -0,0 +1,42 @@
+# Spec: Data Attributes (Layer 07)
+
+File: `src/layers/07-data-attrs.css`
+
+## Purpose
+
+The ASW vocabulary extension layer. `data-*` attributes express concepts that HTML has no native element for. This is the core differentiator — the semantic vocabulary agents use.
+
+## Vocabulary
+
+### Task states
+- `data-task="done|todo|blocked|wip"` — task status indicators
+
+### Callouts
+- `data-callout="note|tip|warning|error"` — admonition blocks
+
+### Status
+- `data-status="active|sleeping|blocked"` — entity status
+
+### Links
+- `data-wikilink` — vault/wiki-style note links
+
+### Layout
+- `data-layout="docs|grid-2|grid-3|console"` — page layout selection
+
+### Table of contents
+- `data-toc` — marks an element as an in-page TOC
+
+### Roles
+- `data-role="breadcrumb|steps|accordion|card"` — component role disambiguation
+
+## Design Principle
+
+Every `data-*` attribute added to the vocabulary is cognitive load on every agent using the framework. Add only what cannot be expressed by existing semantic HTML.
+
+**The bar for addition:** "Can this be expressed with an existing HTML element?" If yes, don't add a data attribute.
+
+## Constraints
+
+- References only semantic aliases from `01-tokens.css`
+- Each attribute must have a clear semantic meaning (not stylistic)
+- Attribute values should be exhaustive and documented