Release 0.14.0: public /docs user guide (DOCS.md served at /docs)

Ships DOCS.md and the /docs route — a plain-prose translation of
SPEC.md for users, distinct from the binding spec. Originating need
was the admin-vs-owner role distinction on /admin/users (§6.1);
response is a single guide that covers the framework's user-facing
surfaces end-to-end (roles, proposing, branches, PRs, graduation,
notifications). Mirrors /philosophy: markdown file at repo root +
sibling backend loader + MarkdownPreview render. No schema migration.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/src/App.jsx

@@ -11,6 +11,7 @@ import Landing from './components/Landing.jsx'
 import Login from './components/Login.jsx'
 import BetaPending from './components/BetaPending.jsx'
 import Philosophy from './components/Philosophy.jsx'
+import Docs from './components/Docs.jsx'
 import NotificationSettings from './components/NotificationSettings.jsx'
 import Admin from './components/Admin.jsx'
 import ToastHost, { showToast } from './components/ToastHost.jsx'
@@ -111,6 +112,9 @@ export default function App() {
           <Link to="/philosophy" className="header-about" title="Why this exists (§14)">
             About
           </Link>
+          <Link to="/docs" className="header-about" title="User guide">
+            Docs
+          </Link>
           {viewer && (
             <Link to="/settings/notifications" className="header-settings" title="Notification settings (§15)">
               Settings
@@ -153,6 +157,7 @@ export default function App() {
           <Route path="/login" element={<Login />} />
           <Route path="/beta-pending" element={<BetaPending viewer={viewer} />} />
           <Route path="/philosophy" element={<PhilosophyWithSidebar viewer={viewer} />} />
+          <Route path="/docs" element={<DocsWithSidebar viewer={viewer} />} />
           {/* §14.5 / §14.6: cookie-consent companions to /philosophy.
               Available to anonymous and authenticated viewers alike. */}
           <Route path="/privacy" element={<PolicyShell><Privacy /></PolicyShell>} />
@@ -221,6 +226,14 @@ function PhilosophyWithSidebar({ viewer }) {
   )
 }
 
+function DocsWithSidebar({ viewer }) {
+  return (
+    <main className="chrome-pane">
+      <Docs authenticated={!!viewer} />
+    </main>
+  )
+}
+
 function NotificationSettingsWithSidebar({ viewer }) {
   return (
     <main className="chrome-pane">