fix(config): disable JIT context loading by default (#24364)

packages/cli/src/config/settingsSchema.ts

@@ -2056,7 +2056,7 @@ const SETTINGS_SCHEMA = {
         label: 'JIT Context Loading',
         category: 'Experimental',
         requiresRestart: true,
-        default: true,
+        default: false,
         description: 'Enable Just-In-Time (JIT) context loading.',
         showInDialog: false,
       },

packages/cli/src/ui/components/Footer.test.tsx

@@ -441,6 +441,7 @@ describe('<Footer />', () => {
 
     it('renders footer with all optional sections hidden (minimal footer)', async () => {
       const { lastFrame, unmount } = await renderWithProviders(<Footer />, {
+        config: mockConfig,
         width: 120,
         uiState: { sessionStats: mockSessionStats },
         settings: createMockSettings({
@@ -558,6 +559,7 @@ describe('<Footer />', () => {
   describe('Footer Token Formatting', () => {
     const renderWithTokens = async (tokens: number) => {
       const result = await renderWithProviders(<Footer />, {
+        config: mockConfig,
         width: 120,
         uiState: {
           sessionStats: {
@@ -810,6 +812,7 @@ describe('<Footer />', () => {
 
     it('handles empty items array', async () => {
       const { lastFrame, unmount } = await renderWithProviders(<Footer />, {
+        config: mockConfig,
         width: 120,
         uiState: { sessionStats: mockSessionStats },
         settings: createMockSettings({

packages/core/src/config/config.ts

@@ -1151,7 +1151,7 @@ export class Config implements McpContext, AgentLoopContext {
       modelConfigServiceConfig ?? DEFAULT_MODEL_CONFIGS,
     );
 
-    this.experimentalJitContext = params.experimentalJitContext ?? true;
+    this.experimentalJitContext = params.experimentalJitContext ?? false;
     this.experimentalMemoryManager = params.experimentalMemoryManager ?? false;
     this.memoryBoundaryMarkers = params.memoryBoundaryMarkers ?? ['.git'];
     this.contextManagement = {