feat(core): Implement JIT context manager and setting (#14324)

Co-authored-by: Abhi <43648792+abhipatel12@users.noreply.github.com>

packages/cli/src/config/config.ts

@@ -635,6 +635,7 @@ export async function loadCliConfig(
     enableExtensionReloading: settings.experimental?.extensionReloading,
     enableModelAvailabilityService:
       settings.experimental?.isModelAvailabilityServiceEnabled,
+    experimentalJitContext: settings.experimental?.jitContext,
     noBrowser: !!process.env['NO_BROWSER'],
     summarizeToolOutput: settings.model?.summarizeToolOutput,
     ideMode,

packages/cli/src/config/settingsSchema.ts

@@ -1310,6 +1310,15 @@ const SETTINGS_SCHEMA = {
         description: 'Enable model routing using new availability service.',
         showInDialog: false,
       },
+      jitContext: {
+        type: 'boolean',
+        label: 'JIT Context Loading',
+        category: 'Experimental',
+        requiresRestart: true,
+        default: false,
+        description: 'Enable Just-In-Time (JIT) context loading.',
+        showInDialog: false,
+      },
       codebaseInvestigatorSettings: {
         type: 'object',
         label: 'Codebase Investigator Settings',