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.

package.json

@@ -0,0 +1,14 @@
+{
+  "name": "asw",
+  "private": true,
+  "dependencies": {
+    "open-props": "^1.7.0"
+  },
+  "devDependencies": {
+    "postcss": "^8.4.0",
+    "postcss-cli": "^11.0.0",
+    "postcss-import": "^16.0.0",
+    "postcss-custom-media": "^11.0.0",
+    "cssnano": "^7.0.0"
+  }
+}