fix(cli): register web prompt context before boot

apps/cli/tests/web-prompt-context.spec.ts

@@ -0,0 +1,29 @@
+import { sep } from 'node:path'
+import { Context } from 'cordis'
+import { describe, expect, it } from 'vitest'
+import SystemPrompt from '@deepseek-ai/dsh-system-prompt'
+import { HARNESS_SOURCE_SECTION } from '@deepseek-ai/dsh-app-boot'
+import { prepareWebPromptContext } from '../src/web.ts'
+
+describe('prepareWebPromptContext', () => {
+  it('installs both sections before a later systemPrompt consumer activates', async () => {
+    const ctx = new Context()
+    const sourceRoot = `${sep}opt${sep}harness-src`
+    let observedNames: string[] | undefined
+    try {
+      prepareWebPromptContext(ctx, sourceRoot)
+      const consumer = ctx.inject(['systemPrompt'], async (promptCtx) => {
+        const assembly = await promptCtx.systemPrompt.assemble()
+        observedNames = assembly.sections.map(section => section.name)
+      })
+
+      await ctx.plugin(SystemPrompt, { persona: 'You are a coding agent.' })
+      await consumer
+
+      expect(observedNames).toContain(HARNESS_SOURCE_SECTION)
+      expect(observedNames).toContain('app:web-surface')
+    } finally {
+      await ctx.fiber.dispose()
+    }
+  })
+})