init: arcadia-admin — admin webapp for arcadia-core, cloned from vibespace

Initial commit. Spun up via the docs/STARTER.md recipe: cp from vibespace,
reset git, rename package, set brand to "Arcadia Admin" with Shield icon
in app/lib/identity.ts.

Inherits the full Crema sibling-lib wiring including @crema/arcadia-client
(typed HTTP + Phoenix Channels realtime against arcadia-core) and
@crema/arcadia-auth-ui (login/signup/password-reset/2FA forms). The /login
route already renders <LoginForm>; <ArcadiaProvider> in app/root.tsx reads
VITE_ARCADIA_URL (default localhost:4000) and VITE_ARCADIA_TENANT (default
"default").

CLAUDE.md and README rewritten to frame this as the admin app for
arcadia-core. docs/STARTER.md removed — arcadia-admin is a leaf consumer,
not a downstream starter.

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

app/routes/home.tsx

@@ -0,0 +1,96 @@
+import { ArrowRight, Sparkles, Boxes, Activity, BookOpen } from "lucide-react"
+import { Link } from "react-router"
+
+import { AppShell } from "~/components/layout/app-shell"
+import {
+  Card,
+  CardContent,
+  CardDescription,
+  CardHeader,
+  CardTitle,
+} from "~/components/ui/card"
+import { pageTitle } from "~/lib/page-meta"
+
+export const meta = () => pageTitle("Overview")
+
+const tiles = [
+  {
+    to: "/assistant",
+    icon: Sparkles,
+    title: "Assistant",
+    body: "AI-first surface — chat, suggestions, and full UI control.",
+    accent: true,
+  },
+  {
+    to: "/resources",
+    icon: Boxes,
+    title: "Resources",
+    body: "Traditional list + detail surface for managed entities.",
+  },
+  {
+    to: "/activity",
+    icon: Activity,
+    title: "Activity",
+    body: "Event stream and audit log.",
+  },
+  {
+    to: "/library",
+    icon: BookOpen,
+    title: "Library",
+    body: "Saved items, templates, reusable artifacts.",
+  },
+]
+
+export default function HomeRoute() {
+  return (
+    <AppShell title="Overview">
+      <Card>
+        <CardHeader>
+          <CardTitle>Welcome</CardTitle>
+          <CardDescription>
+            A hybrid traditional + AI-first scaffold. Use the rail to navigate;
+            the Assistant can drive the UI on your behalf — try{" "}
+            <kbd className="rounded border bg-muted px-1.5 py-0.5 font-mono text-xs">
+              ⌘⇧P
+            </kbd>{" "}
+            for the script runner.
+          </CardDescription>
+        </CardHeader>
+      </Card>
+
+      <div className="grid gap-4 md:grid-cols-2">
+        {tiles.map((t) => {
+          const Icon = t.icon
+          return (
+            <Link
+              key={t.to}
+              to={t.to}
+              data-action={`home-tile-${t.title.toLowerCase()}`}
+              className="group block"
+            >
+              <Card
+                className={[
+                  "h-full transition-colors",
+                  t.accent
+                    ? "border-primary/30 bg-primary/5 hover:border-primary/50"
+                    : "hover:border-foreground/20",
+                ].join(" ")}
+              >
+                <CardHeader>
+                  <div className="mb-2 flex size-9 items-center justify-center rounded-lg bg-primary/10 text-primary">
+                    <Icon className="size-5" />
+                  </div>
+                  <CardTitle className="flex items-center gap-2">
+                    {t.title}
+                    <ArrowRight className="size-4 opacity-0 transition-opacity group-hover:opacity-100" />
+                  </CardTitle>
+                  <CardDescription>{t.body}</CardDescription>
+                </CardHeader>
+              </Card>
+            </Link>
+          )
+        })}
+      </div>
+    </AppShell>
+  )
+}