Add dorveille article and full Hugo site scaffold

- content/dorveille.md: 'On the Craft of Invisible Systems'
- assets/css/: ASW layer system (00-reset through 09-landing + Open Props)
- layouts/: baseof, single, list, index — semantic HTML, no classes
- hugo.toml: baseURL asw.trentuna.com, PostCSS + minify pipeline
- package.json: postcss-import, postcss-custom-media, cssnano
- .gitignore: excludes public/, node_modules, build artifacts

Site builds to public/ via hugo --minify. nginx serves public/ statically.

layouts/_default/list.html

@@ -0,0 +1,38 @@
+{{ define "main" }}
+  <nav>
+    <ul><li><a href="/"><strong>{{ .Site.Title }}</strong></a></li></ul>
+    <ul>
+      <li><a href="/docs/">Docs</a></li>
+      <li><a href="/examples/">Examples</a></li>
+    </ul>
+  </nav>
+
+  <main>
+    <article data-layout="prose">
+
+      <header>
+        <h1>{{ .Title }}</h1>
+        {{ with .Description }}<p>{{ . }}</p>{{ end }}
+      </header>
+
+      <section>
+        {{ range .Pages }}
+        <article>
+          <header>
+            <h2><a href="{{ .Permalink }}">{{ .Title }}</a></h2>
+            <p data-text="dim">
+              <time datetime="{{ .Date.Format "2006-01-02" }}">{{ .Date.Format "January 2006" }}</time>
+            </p>
+          </header>
+          {{ with .Summary }}<p>{{ . }}</p>{{ end }}
+        </article>
+        {{ end }}
+      </section>
+
+    </article>
+  </main>
+
+  <footer>
+    <small><a href="/">{{ .Site.Title }}</a> · {{ now.Format "2006" }}</small>
+  </footer>
+{{ end }}