feat(ui): add trajectory inspection ledger

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

@@ -0,0 +1,42 @@
+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('omits raw HTML and returns a useful fallback when no paragraph exists', () => {
+    const markdown = '<script>alert(1)</script>\n\n## Safe heading'
+    expect(extractMarkdownPlainText(markdown)).toBe('Safe heading')
+    expect(extractMarkdownPlainText(markdown, { mode: 'first-paragraph' })).toBe('Safe heading')
+  })
+})