refactor: restructure repo into src/ site/ dist/ vendor/ packs/

Separate framework source from website:
- src/layers/ + src/main.css: CSS framework source (was assets/css/)
- site/: Hugo website (content/, layouts/, hugo.toml)
- dist/: built output (asw.css, asw.min.css)
- vendor/open-props/: vendored dependency with version tracking
- Hugo module mounts: dist/ → static, site runs from site/

Build: hugo --source site/ passes (105 pages).
npm run build produces dist/asw.css.

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

site/hugo_stats.json

@@ -0,0 +1,227 @@
+{
+  "htmlElements": {
+    "tags": [
+      "a",
+      "article",
+      "aside",
+      "blockquote",
+      "body",
+      "button",
+      "code",
+      "dd",
+      "details",
+      "dialog",
+      "div",
+      "dl",
+      "dt",
+      "em",
+      "footer",
+      "h1",
+      "h2",
+      "h3",
+      "h4",
+      "h5",
+      "head",
+      "header",
+      "hgroup",
+      "hr",
+      "html",
+      "li",
+      "link",
+      "main",
+      "mark",
+      "meta",
+      "nav",
+      "ol",
+      "p",
+      "pre",
+      "script",
+      "section",
+      "small",
+      "span",
+      "strong",
+      "summary",
+      "sup",
+      "table",
+      "tbody",
+      "td",
+      "th",
+      "thead",
+      "time",
+      "title",
+      "tr",
+      "ul"
+    ],
+    "classes": [
+      "footnote-backref",
+      "footnote-ref",
+      "footnotes",
+      "highlight"
+    ],
+    "ids": [
+      "TableOfContents",
+      "a-taxonomy-of-agency",
+      "accordion",
+      "actions-row",
+      "actor-variants",
+      "agentic-semantic-web",
+      "agentic-task-pipeline",
+      "ai-disclosure",
+      "another-subsection",
+      "area-chart",
+      "article",
+      "aside",
+      "asw-data-attribute-vocabulary",
+      "attributes",
+      "axis-labels",
+      "badge",
+      "bar-chart",
+      "bar-spacing",
+      "blockquote",
+      "body",
+      "body-text",
+      "box-sizing",
+      "breadcrumb",
+      "callouts",
+      "card-grid",
+      "choosing-between-the-two",
+      "coda",
+      "code",
+      "column-chart",
+      "compact-form",
+      "conclusion",
+      "container-auto-sizing",
+      "craft-as-methodology",
+      "cta-links",
+      "custom-colours",
+      "customising-chart-dimensions",
+      "customising-the-reset",
+      "data-abstract--data-byline--data-section",
+      "data-badge",
+      "data-callout",
+      "data-diff--data-diff-line--data-diff-file",
+      "data-layout",
+      "data-nav",
+      "data-reading-progress",
+      "data-redacted",
+      "data-role",
+      "data-session--data-mode",
+      "data-status",
+      "data-subnav",
+      "data-tag--data-hash",
+      "data-task",
+      "data-text",
+      "data-tooltip--data-tooltip-position",
+      "data-visible",
+      "data-wikilink--data-unresolved",
+      "demo-dialog",
+      "details--summary",
+      "dialog",
+      "dialog--modal",
+      "docs-layout",
+      "document-baseline",
+      "example-full-page-skeleton",
+      "figure",
+      "fluid",
+      "fn:1",
+      "fn:2",
+      "fn:3",
+      "fnref:1",
+      "fnref:2",
+      "fnref:3",
+      "font-size",
+      "footer",
+      "getting-started-with-asw-hugo",
+      "grid",
+      "grid-layouts",
+      "grouped-accordion",
+      "header",
+      "headings",
+      "hero",
+      "horizontal-rule",
+      "how-data-binding-works",
+      "hugo--chroma",
+      "hugo-integration",
+      "inline-definition-list",
+      "inline-diffs",
+      "inline-elements",
+      "install-pill",
+      "installation",
+      "introduction",
+      "layer-1--open-props-palette",
+      "layer-2--semantic-aliases",
+      "layer-3--component-tokens",
+      "layout-primitives",
+      "line-chart",
+      "line-types",
+      "links",
+      "lists",
+      "longer-trail",
+      "main",
+      "nav",
+      "navigation",
+      "nested-lists",
+      "notes",
+      "overview",
+      "principles-of-invisible-design",
+      "prismjs-non-hugo",
+      "progress",
+      "prose",
+      "pseudo-elements",
+      "redacted-content",
+      "references",
+      "related",
+      "report",
+      "search",
+      "section",
+      "section-one",
+      "section-three",
+      "section-two",
+      "session-blocks",
+      "setup",
+      "setup-1",
+      "spacing-scale",
+      "stacked-charts",
+      "states",
+      "stats-row",
+      "status-dashboard-pattern",
+      "steps",
+      "subsection",
+      "tables",
+      "tasks",
+      "text-utilities",
+      "the-class-problem",
+      "the-design-principle",
+      "the-dorveille-principle",
+      "the-economics-of-attention",
+      "the-landmark-map",
+      "the-problem-of-discontinuity",
+      "the-table-of-hours",
+      "theming-a-site",
+      "three-columns",
+      "timeline",
+      "token-colour-mapping",
+      "token-mapping-prism",
+      "two-columns",
+      "typography",
+      "typography-scale",
+      "usage",
+      "usage-1",
+      "usage-notes",
+      "values",
+      "vertical-layout",
+      "vocabulary-as-protocol",
+      "what-agents-need",
+      "what-is-asw",
+      "what-it-does",
+      "what-it-leaves-alone",
+      "what-persists",
+      "what-this-is",
+      "what-we-subtract",
+      "what-you-get",
+      "why-semantic-html",
+      "wikilinks",
+      "wrapper"
+    ]
+  }
+}