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-primitives/tests/markdown-plain-text.client.spec.ts

@@ -0,0 +1,71 @@
+import { describe, expect, it } from 'vitest'
+import { extractMarkdownPlainText } from '@deepseek-ai/dsh-client-ui-primitives'
+
+const MARKDOWN = [
+  '# Release notes',
+  '',
+  'First **paragraph** with [a link](https://example.com) and ![diagram](diagram.png).',
+  '',
+  '- shipped',
+  '- `verified`',
+  '',
+  '```ts',
+  'const ready = true',
+  '```',
+].join('\n')
+
+describe('extractMarkdownPlainText', () => {
+  it('projects the complete GFM document without presentation syntax', () => {
+    expect(extractMarkdownPlainText(MARKDOWN)).toBe([
+      'Release notes',
+      '',
+      'First paragraph with a link and diagram.',
+      '',
+      'shipped',
+      'verified',
+      '',
+      'const ready = true',
+    ].join('\n'))
+  })
+
+  it('selects the first visible line or first semantic paragraph', () => {
+    expect(extractMarkdownPlainText(MARKDOWN, { mode: 'first-line' })).toBe('Release notes')
+    expect(extractMarkdownPlainText(MARKDOWN, { mode: 'first-paragraph' }))
+      .toBe('First paragraph with a link and diagram.')
+  })
+
+  it('preserves raw HTML while removing Markdown presentation markup', () => {
+    const block = [
+      '<background-task-complete id="trajectory-ui-watch">',
+      'Command: pnpm test',
+      'Exit code: 0',
+      '</background-task-complete>',
+    ].join('\n')
+    expect(extractMarkdownPlainText(block)).toBe(block)
+    expect(extractMarkdownPlainText('**Status:** <span data-state="ok">ready</span>'))
+      .toBe('Status: <span data-state="ok">ready</span>')
+    expect(extractMarkdownPlainText(block, { mode: 'first-paragraph' }))
+      .toBe('<background-task-complete id="trajectory-ui-watch">')
+  })
+
+  it('projects GFM tables, references, hard breaks, and block structure', () => {
+    const markdown = [
+      '> first\\',
+      '> second with ![diagram][asset] and <span>visible</span>',
+      '',
+      '---',
+      '',
+      '| Name | Value |',
+      '| --- | --- |',
+      '| alpha | `1` |',
+      '',
+      '[asset]: diagram.png',
+    ].join('\n')
+    expect(extractMarkdownPlainText(markdown)).toBe([
+      'first second with diagram and <span>visible</span>',
+      '',
+      'Name\tValue',
+      'alpha\t1',
+    ].join('\n'))
+  })
+})