chore(cli): stop default-loading @objectstack/studio app package

os dev / os start / os serve no longer register the Studio one-app
package by default. The console ships a dedicated Studio surface at
/_console/studio/<pkg>/<pillar>, so Studio no longer needs to exist as
a navigable app tile in "Your apps".

Setup and Account app packages are unchanged. The @objectstack/studio
package itself is kept (still registerable explicitly; ADR-0048
app-split test continues to cover it).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: os-zhuang

packages/cli/src/commands/serve.ts

@@ -1261,12 +1261,14 @@ export default class Serve extends Command {
             }));
             trackPlugin('Auth');
 
-            // ADR-0048 — the platform apps (Setup/Studio/Account) moved out of
+            // ADR-0048 — the platform apps (Setup/Account) moved out of
             // plugin-auth's manifest into their own one-app packages. Register
             // each after AuthPlugin (best-effort; skipped if not installed).
+            // NOTE: @objectstack/studio is intentionally NOT default-loaded — the
+            // console ships a dedicated Studio surface at /_console/studio/<pkg>/<pillar>,
+            // so Studio no longer needs to exist as a navigable app tile.
             for (const [appPkg, factory] of [
               ['@objectstack/setup', 'createSetupAppPlugin'],
-              ['@objectstack/studio', 'createStudioAppPlugin'],
               ['@objectstack/account', 'createAccountAppPlugin'],
             ] as const) {
               try {

packages/plugins/plugin-dev/src/dev-plugin.ts

@@ -543,12 +543,14 @@ export class DevPlugin implements Plugin {
         ctx.logger.warn('  ✘ @objectstack/plugin-auth not installed — skipping auth');
       }
 
-      // ADR-0048 — the platform apps (Setup/Studio/Account) moved out of
+      // ADR-0048 — the platform apps (Setup/Account) moved out of
       // plugin-auth's manifest into their own one-app packages. Register each
       // after AuthPlugin so they load alongside the auth objects they navigate.
+      // NOTE: @objectstack/studio is intentionally NOT default-loaded — the
+      // console ships a dedicated Studio surface at /_console/studio/<pkg>/<pillar>,
+      // so Studio no longer needs to exist as a navigable app tile.
       for (const spec of [
         ['@objectstack/setup', 'createSetupAppPlugin'],
-        ['@objectstack/studio', 'createStudioAppPlugin'],
         ['@objectstack/account', 'createAccountAppPlugin'],
       ] as const) {
         try {