fix(upgrade): always call checkOrPromptToEnableAppModExtension after install/update

Consolidate the install path — both fresh install and version upgrade
now go through the same checkOrPromptToEnableAppModExtension flow.

Co-Authored-By: Claude Opus 4 <noreply@anthropic.com>

Author: FrankLiu4138

.squire/.gitignore

@@ -0,0 +1,3 @@
+# Ignore everything in .squire/ except this file
+*
+!.gitignore

src/upgrade/utility.ts

@@ -169,12 +169,11 @@ export async function checkOrInstallAppModExtensionForUpgrade(
             installedVersion,
             minRequiredVersion: Upgrade.MIN_APPMOD_VERSION,
         });
-        await commands.executeCommand("workbench.extensions.installExtension", ExtensionName.APP_MODERNIZATION_FOR_JAVA);
-    } else {
-        await commands.executeCommand("workbench.extensions.installExtension", ExtensionName.APP_MODERNIZATION_FOR_JAVA);
-        await checkOrPromptToEnableAppModExtension("upgrade");
     }
 
+    await commands.executeCommand("workbench.extensions.installExtension", ExtensionName.APP_MODERNIZATION_FOR_JAVA);
+    await checkOrPromptToEnableAppModExtension("upgrade");
+
     // Verify gotoAgentMode command is available after install/update
     await waitForCommand(Commands.GOTO_AGENT_MODE);
 }