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/lib/identity.ts

@@ -0,0 +1,40 @@
+// Project identity — brand and user. Hooks return module-singleton defaults
+// so routes don't have to thread props. Swap the constants below for your
+// project's brand; swap useUser() for a real session hook when you wire auth.
+
+import { Shield, type LucideIcon } from "lucide-react"
+
+export type Brand = {
+  name: string
+  icon: LucideIcon
+}
+
+export type User = {
+  name: string
+  email: string
+  initials: string
+}
+
+const brand: Brand = {
+  name: "Arcadia Admin",
+  icon: Shield,
+}
+
+const currentUser: User = {
+  name: "Signed-in user",
+  email: "user@example.com",
+  initials: "U",
+}
+
+export function useBrand(): Brand {
+  return brand
+}
+
+export function useUser(): User {
+  return currentUser
+}
+
+/** Convenience for non-React modules (page meta, scripts, etc). */
+export function getBrand(): Brand {
+  return brand
+}