init: scaffold OPENBUREAU site with shibui-derived theme

- Hugo site for openbureau.ch (Deutsch, i18n-ready for EN/IT)
- Theme themes/openbureau/ = local copy of shibui, customized via
  site-level layouts and assets to keep the theme reference clean
- Editorial typography stack: Newsreader serif body, Space Grotesk
  display, Inter for listings, IBM Plex Mono for technical meta
- Content structure: library/ (Theorie, Büroführung, Software) with
  manifest and colophon at root; software is a library category, not
  a separate top-level
- Three views over one source: Journal (chronological home),
  Library (atlas grouped by section + tag cloud), single articles

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

hugo.yaml

@@ -0,0 +1,95 @@
+# OPENBUREAU — Hugo site configuration
+baseURL: "https://openbureau.ch/"
+title: "OPENBUREAU"
+theme: "openbureau"
+
+enableRobotsTXT: true
+enableGitInfo: false
+hasCJKLanguage: false
+
+defaultContentLanguage: de
+defaultContentLanguageInSubdir: false
+
+languages:
+  de:
+    label: Deutsch
+    locale: de_CH
+    weight: 1
+    title: OPENBUREAU
+    params:
+      description: "Eine offene Plattform für Architekturpraxis, Theorie und Werkzeuge."
+  # en:
+  #   label: English
+  #   locale: en
+  #   weight: 2
+  #   title: OPENBUREAU
+  # it:
+  #   label: Italiano
+  #   locale: it
+  #   weight: 3
+  #   title: OPENBUREAU
+
+module:
+  hugoVersion:
+    extended: false
+    min: "0.146.0"
+
+markup:
+  goldmark:
+    renderer:
+      unsafe: true
+  highlight:
+    noClasses: true
+    style: algol_nu
+    codeFences: true
+    guessSyntax: true
+    lineNos: false
+    tabWidth: 4
+  tableOfContents:
+    startLevel: 2
+    endLevel: 4
+    ordered: false
+
+taxonomies:
+  tag: tags
+
+outputs:
+  home: [html, rss]
+  page: [html]
+  section: [html, rss]
+
+pagination:
+  pagerSize: 20
+
+menus:
+  main:
+    - name: JOURNAL
+      pageRef: /
+      weight: 10
+    - name: LIBRARY
+      pageRef: /library
+      weight: 20
+    - name: MANIFEST
+      pageRef: /manifest
+      weight: 30
+    - name: FORUM
+      url: https://openstudio.kgva.ch
+      weight: 40
+    - name: CODE
+      url: https://gitea.kgva.ch
+      weight: 50
+
+params:
+  author:
+    name: "Karim Gabriele Varano"
+    email: "karim@gabrielevarano.ch"
+  showreadingtime: true
+  showlastmod: true
+  comments: false
+  # Accent for OPENBUREAU
+  accent: "#b54a2c"
+
+frontmatter:
+  date: ['date', 'publishDate', 'lastmod']
+  lastmod: [':git', 'lastmod', 'date', 'publishDate']
+  publishDate: ['publishDate', 'date']