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/content/notes/status.md

@@ -0,0 +1,53 @@
+---
+title: "Status"
+description: "Render operational state with data-status — online, degraded, offline, unknown."
+section: notes
+prev-url: "wikilinks/"
+prev-title: "Wikilinks"
+next-url: "diff/"
+next-title: "Diff"
+type: notes
+date: 2026-04-09
+tags: ["notes", "status", "reference"]
+ai-disclosure: "generated"
+ai-model: "claude-sonnet-4-5"
+ai-provider: "Anthropic"
+
+---
+
+## Overview
+
+Use `data-status` on any element to convey operational state. ASW renders a coloured indicator — no CSS classes required.
+
+```html
+<span data-status="online">API Gateway</span>
+<span data-status="degraded">Search Index</span>
+<span data-status="offline">Legacy Auth</span>
+<span data-status="unknown">Webhook Relay</span>
+```
+
+## Values
+
+| Value | Meaning | Indicator |
+|-------|---------|-----------|
+| `online` | Fully operational | Green dot |
+| `degraded` | Reduced capacity or elevated errors | Amber dot |
+| `offline` | Not reachable or deliberately down | Red dot |
+| `unknown` | State not yet determined | Grey dot |
+
+## Status Dashboard Pattern
+
+Combine with a `<dl>` for a compact service health panel:
+
+```html
+<dl>
+  <dt>API Gateway</dt>     <dd data-status="online">online</dd>
+  <dt>Search Index</dt>    <dd data-status="degraded">degraded</dd>
+  <dt>Webhook Relay</dt>   <dd data-status="offline">offline</dd>
+  <dt>Analytics</dt>       <dd data-status="unknown">unknown</dd>
+</dl>
+```
+
+## Usage Notes
+
+`data-status` is intentionally display-only — it carries no ARIA role. For accessibility, pair with visible text (as shown above) rather than relying on the colour dot alone.