refactor: apply repository naming contract

Apply the accepted pre-release package, service, type, directory, and role renames as one repository-wide change.

packages/client/ui-settings-plugins/tests/invariant.client.spec.ts

@@ -0,0 +1,25 @@
+/** The package's node half: an empty host body and an explained empty invariant companion. */
+
+import { describe, expect, it } from 'vitest'
+import { Context } from '@deepseek-ai/cordis'
+import InvariantRegistry from '@deepseek-ai/dsh-invariants'
+import * as PluginConfigInvariant from '@deepseek-ai/dsh-client-ui-settings-plugins/invariant'
+
+describe('invariant companion', () => {
+  it('reserves package ownership with an empty installer', async () => {
+    const ctx = new Context()
+    await ctx.plugin(InvariantRegistry, { enabled: true })
+
+    await expect(ctx.plugin(PluginConfigInvariant).await()).resolves.toBeDefined()
+  })
+
+  it('has an empty node half', async () => {
+    const { apply } = await import('@deepseek-ai/dsh-client-ui-settings-plugins')
+
+    // The host body exists only so the plugin appears in the host cordis.yml;
+    // every surface this package ships lives in the browser half.
+    apply()
+
+    expect(typeof apply).toBe('function')
+  })
+})