refactor(client): name the compile face in every client test filename

A test file under packages/client now says which face it covers:
`*.client.spec.{ts,tsx}` and its `*.client.{ts,tsx}` helpers belong to the
Client aggregate, `*.host.spec.ts` to the host aggregate. The carrier's four
node-half specs take the Host suffix.

The two suffixes are mutually exclusive, so each aggregate excludes the
other's and both keep one broad test glob: `exclude` wins over `include`, and
`packages/client/**` no longer has to be excluded wholesale from the host
program with per-file `files` entries carved back out of it. A Host-face spec
that reaches only Host source therefore needs no cross-face project
reference, which the split-project rule rejects.

vitest still discovers every file through `**/*.spec.{ts,tsx}`.

packages/client/ui-question/tests/node-plugin.client.spec.ts

@@ -0,0 +1,31 @@
+import { Context } from '@deepseek-ai/cordis'
+import { afterEach, describe, expect, it } from 'vitest'
+import ToolRegistry from '@deepseek-ai/dsh-tools'
+import SystemPrompt from '@deepseek-ai/dsh-system-prompt'
+import UserInteractionService from '@deepseek-ai/dsh-user-interaction'
+import { apply } from '../src/index.ts'
+
+let ctx: Context | undefined
+
+afterEach(async () => {
+  await ctx?.fiber.dispose()
+  ctx = undefined
+})
+
+describe('ui-question node plugin', () => {
+  it('mounts no model-facing tool', async () => {
+    ctx = new Context()
+    await ctx.plugin(SystemPrompt)
+    await ctx.plugin(ToolRegistry)
+    await ctx.plugin(UserInteractionService)
+
+    await ctx.plugin({ apply }).await()
+
+    // Selecting the Web question FEATURE must not hand every agent the tool.
+    // `ctx.tools.register` on an unscoped host context files into the global
+    // layer, which merges into every agent's view regardless of the preset
+    // that composed it — so a two-tool benchmark preset would really present
+    // three. The `tool-ask-user` row belongs to the presets that want it.
+    expect(ctx.tools.get('ask_user_question')).toBeUndefined()
+  })
+})