Upgrade file picker to flash 3.1 lite

Author: jahooma

agents/__tests__/file-picker.test.ts

@@ -80,11 +80,6 @@ describe('file-picker agent', () => {
   })
 
   describe('createFilePicker - max mode', () => {
-    test('uses grok model', () => {
-      const maxPicker = createFilePicker('max')
-      expect(maxPicker.model).toBe('x-ai/grok-4.1-fast')
-    })
-
     test('spawns two file-listers in parallel', () => {
       const maxPicker = createFilePicker('max')
       const mockAgentState = createMockAgentState()

agents/file-explorer/file-lister.ts

@@ -4,7 +4,7 @@ import { type SecretAgentDefinition } from '../types/secret-agent-definition'
 export const createFileLister = (): Omit<SecretAgentDefinition, 'id'> => ({
   displayName: 'Liszt the File Lister',
   publisher,
-  model: 'x-ai/grok-4.1-fast',
+  model: 'google/gemini-3.1-flash-lite-preview',
   spawnerPrompt:
     'Lists up to 12 files that are relevant to the prompt within the given directories. Unless you know which directories are relevant, omit the directories parameter. This agent is great for finding files that could be relevant to the prompt.',
   inputSchema: {

agents/file-explorer/file-picker.ts

@@ -13,7 +13,7 @@ export const createFilePicker = (
   mode: FilePickerMode,
 ): Omit<SecretAgentDefinition, 'id'> => {
   const isMax = mode === 'max'
-  const model = isMax ? 'x-ai/grok-4.1-fast' : 'google/gemini-2.5-flash-lite'
+  const model = isMax ? 'google/gemini-3.1-flash-lite-preview' : 'google/gemini-2.5-flash-lite'
 
   return {
     displayName: 'Fletcher the File Fetcher',