refactor: rename @crema/arcadia-client → @crema/arcadia-core-client

Disambiguates the Phoenix/auth client lib from lib-arcadia-agents-client.
Dir lib-arcadia-client → lib-arcadia-core-client; alias updated in
tsconfig paths, vite config, app.css @source, imports, CI and docs.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

README.md

@@ -33,7 +33,7 @@ To use it for real:
 `app/components/layout/app-shell.tsx` — left rail + appbar + avatar dropdown. Brand identity in `app/lib/identity.ts` (`name: "Arcadia Admin"`, icon: `Shield`). The shell is **template code, not a lib** — fork it freely as admin features are added.
 
 ### Arcadia client + auth UI
-- [`@crema/arcadia-client`](../lib-arcadia-client) — typed HTTP client (generic + openapi-fetch-backed `client.typed`), Phoenix Channels realtime, error normalization. Mounted at the root via `<ArcadiaProvider>`.
+- [`@crema/arcadia-core-client`](../lib-arcadia-core-client) — typed HTTP client (generic + openapi-fetch-backed `client.typed`), Phoenix Channels realtime, error normalization. Mounted at the root via `<ArcadiaProvider>`.
 - [`@crema/arcadia-auth-ui`](../lib-arcadia-auth-ui) — login / signup / password reset / 2FA forms, themed via Skyrise tokens. The `/login` route renders `<LoginForm>`.
 
 ### Skyrise theme
@@ -51,7 +51,7 @@ your-workspace/
   arcadia-admin/                ← this repo
   vibespace/                    ← starter that this was cloned from
   reference/arcadia-app/        ← Phoenix backend (read-only reference)
-  lib-arcadia-client/
+  lib-arcadia-core-client/
   lib-arcadia-auth-ui/
   lib-action-bus/
   lib-aifirst-ui/