feat(core): Implement JIT context memory loading and UI sync (#14469)

packages/core/src/utils/environmentContext.test.ts

@@ -92,6 +92,7 @@ describe('getEnvironmentContext', () => {
         getDirectories: vi.fn().mockReturnValue(['/test/dir']),
       }),
       getFileService: vi.fn(),
+      getEnvironmentMemory: vi.fn().mockReturnValue('Mock Environment Memory'),
 
       getToolRegistry: vi.fn().mockReturnValue(mockToolRegistry),
       storage: {
@@ -122,6 +123,7 @@ describe('getEnvironmentContext', () => {
     expect(context).toContain(
       'Here is the folder structure of the current working directories:\n\nMock Folder Structure',
     );
+    expect(context).toContain('Mock Environment Memory');
     expect(getFolderStructure).toHaveBeenCalledWith('/test/dir', {
       fileService: undefined,
     });

packages/core/src/utils/environmentContext.ts

@@ -62,6 +62,7 @@ export async function getEnvironmentContext(config: Config): Promise<Part[]> {
   const platform = process.platform;
   const directoryContext = await getDirectoryContextString(config);
   const tempDir = config.storage.getProjectTempDir();
+  const environmentMemory = config.getEnvironmentMemory();
 
   const context = `
 This is the Gemini CLI. We are setting up the context for our chat.
@@ -69,6 +70,8 @@ Today's date is ${today} (formatted according to the user's locale).
 My operating system is: ${platform}
 The project's temporary directory is: ${tempDir}
 ${directoryContext}
+
+${environmentMemory}
         `.trim();
 
   const initialParts: Part[] = [{ text: context }];

packages/core/src/utils/events.ts

@@ -5,7 +5,6 @@
  */
 
 import { EventEmitter } from 'node:events';
-import type { LoadServerHierarchicalMemoryResponse } from './memoryDiscovery.js';
 
 /**
  * Defines the severity level for user-facing feedback.
@@ -64,7 +63,9 @@ export interface OutputPayload {
 /**
  * Payload for the 'memory-changed' event.
  */
-export type MemoryChangedPayload = LoadServerHierarchicalMemoryResponse;
+export interface MemoryChangedPayload {
+  fileCount: number;
+}
 
 export enum CoreEvent {
   UserFeedback = 'user-feedback',

packages/core/src/utils/memoryDiscovery.test.ts

@@ -932,7 +932,9 @@ included directory memory
       path.join(extensionPath, 'CustomContext.md'),
     );
     expect(config.getGeminiMdFilePaths()).equals(refreshResult.filePaths);
-    expect(mockEventListener).toHaveBeenCalledExactlyOnceWith(refreshResult);
+    expect(mockEventListener).toHaveBeenCalledExactlyOnceWith({
+      fileCount: refreshResult.fileCount,
+    });
   });
 
   it('should include MCP instructions in user memory', async () => {

packages/core/src/utils/memoryDiscovery.ts

@@ -577,7 +577,7 @@ export async function refreshServerHierarchicalMemory(config: Config) {
   config.setUserMemory(finalMemory);
   config.setGeminiMdFileCount(result.fileCount);
   config.setGeminiMdFilePaths(result.filePaths);
-  coreEvents.emit(CoreEvent.MemoryChanged, result);
+  coreEvents.emit(CoreEvent.MemoryChanged, { fileCount: result.fileCount });
   return result;
 }