fix(llm): isolate retry policy histories

packages/examples/tui-demo/tests/tui-agent.spec.ts

@@ -1,6 +1,6 @@
 import { describe, expect, it } from 'vitest'
 import { join } from 'node:path'
-import type { Context } from 'cordis'
+import { Context } from 'cordis'
 import Loader from '@cordisjs/plugin-loader'
 import { TOOL_ORDER_REST } from '@deepseek-ai/dsh-system-prompt'
 import * as tuiAgent from '../src/index.ts'
@@ -21,6 +21,16 @@ function recordingContext(): { readonly ctx: Context; readonly calls: PluginCall
 }
 
 describe('dsh-tui-demo app', () => {
+  it('rejects app-level llmRetry config through plugin validation', async () => {
+    const ctx = new Context()
+    await expect(ctx.plugin(tuiAgent, {
+      provider: 'mock',
+      model: 'mock',
+      workspaceContext: false,
+      llmRetry: { maxTransientRetries: 2 },
+    } as never)).rejects.toThrow(/llmRetry/)
+  })
+
   it('composes the TUI cluster around one fresh exact session identity', () => {
     const { ctx, calls } = recordingContext()
     tuiAgent.composeTuiApp(ctx, {