feat(site): phase 1 — the foundation

Astro 7 with the Node adapter, Starlight mounted at /docs, the token file, both
self-hosted typefaces, the layout shell, and the two build-time checks from §12.

The palette's gold and cyan are sampled from runic-emblem.png rather than
guessed, per §11: 494,059 opaque pixels binned by hue, each value annotated with
its measured contrast against the ground, and restricted rather than brightened
where a ratio fails.

- checkTokens.mjs fails the build on any colour literal outside tokens.css,
  which is what keeps §7's "recolouring is a file copy" promise true.
- checkFacts.mjs re-reads all 14 externally-sourced facts from their authorities
  over the Gitea API and fails on disagreement. It also enforces D13: no email
  address in the source outside brand-default/brand.json.
- Both were negative-tested; neither has ever been allowed to pass by default.

§6 asks for output:'server' with per-page prerender=true. Astro 7 expresses the
same runtime shape as output:'static' with an adapter, opting individual routes
out — so the default is static rather than accidentally server-rendered.

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

src/components/Footer.astro

@@ -0,0 +1,92 @@
+---
+import { brand } from '../lib/brand.mjs';
+import platform from '../data/platform.json';
+
+/**
+ * The footer is on every page, so it is the one place that must never quote a fact from
+ * memory. The version chip reads `platform.json` (§12); the contact address and the links
+ * read `brand.json` (§7, D13).
+ *
+ * `/privacy` and `/terms` are linked from every page (§9) — those pages land in phase 6,
+ * which is why they are the only two entries deliberately left out of the columns below
+ * until then.
+ */
+const year = new Date().getFullYear();
+
+const columns = [
+  {
+    heading: 'Product',
+    links: [
+      { href: '/features/', label: 'Features' },
+      { href: '/architecture/', label: 'Architecture' },
+      { href: '/modules/', label: 'Modules' },
+      { href: '/app/', label: 'Android app' },
+    ],
+  },
+  {
+    heading: 'Documentation',
+    links: [
+      { href: '/docs/', label: 'Getting started' },
+      { href: '/docs/', label: 'Administration' },
+      { href: '/docs/', label: 'Building a module' },
+    ],
+  },
+  {
+    heading: 'Project',
+    links: [
+      { href: brand.giteaOrg, label: 'Source' },
+      { href: brand.discordInvite, label: 'Discord' },
+      { href: '/community/', label: 'Community' },
+    ],
+  },
+];
+
+const isExternal = (href: string) => href.startsWith('http');
+---
+
+<footer class="site-footer">
+  <div class="page">
+    <div class="site-footer__cols">
+      {
+        columns.map((column) => (
+          <section>
+            <h2>{column.heading}</h2>
+            <ul>
+              {column.links.map((link) => (
+                <li>
+                  <a
+                    href={link.href}
+                    rel={isExternal(link.href) ? 'noopener noreferrer' : undefined}
+                  >
+                    {link.label}
+                  </a>
+                </li>
+              ))}
+            </ul>
+          </section>
+        ))
+      }
+    </div>
+
+    <div class="site-footer__legal">
+      <p>
+        {brand.siteName} is free software under the{' '}
+        <a href="https://www.gnu.org/licenses/gpl-3.0.html" rel="noopener noreferrer"
+          >GPL-3.0-or-later</a
+        >. &copy; {year}.
+      </p>
+      <p class="site-footer__meta">
+        <span class="chip chip--version">Protocol {platform.protocol}</span>
+        <span class="chip chip--version">Bundle {platform.bundle.tag}</span>
+      </p>
+    </div>
+  </div>
+</footer>
+
+<style>
+  .site-footer__meta {
+    display: flex;
+    gap: 0.5rem;
+    flex-wrap: wrap;
+  }
+</style>