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

[os-zhuang]

What

os dev / os start / os serve no longer default-load the @objectstack/studio one-app package. The console now ships a dedicated Studio surface at /_console/studio/<package-id>/<pillar>, so Studio no longer needs to exist as a navigable app tile in the console home "Your apps" list.

Removed the @objectstack/studio entry from the two ADR-0048 default app-registration loops:

• packages/cli/src/commands/serve.ts (the shared boot path for os dev/os start/os serve)
• packages/plugins/plugin-dev/src/dev-plugin.ts (dev-plugin boot path)

Setup and Account app packages are unchanged. The @objectstack/studio package itself is kept — it's still registerable explicitly, and the ADR-0048 app-split test continues to cover it.

Verification

• Build green: @objectstack/cli, @objectstack/plugin-dev, and the full example-showcase dependency graph.
• Unit test green: packages/cli/src/adr-0048-app-split.test.ts (4/4) — studio package still registers when used explicitly.
• Real boot of example-showcase from this branch:
  • Loaded plugins include @objectstack/setup, @objectstack/account — no @objectstack/studio.
  • GET /api/v1/meta/app returns 3 apps: showcase_app, setup, account — studio absent (this endpoint is the data source for the home "Your apps" tiles).

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
spec	Ready	Preview, Comment	Jul 6, 2026 10:35pm

[github-actions]

📓 Docs Drift Check

This PR changes 2 package(s): @objectstack/cli, @objectstack/plugin-dev.

15 hand-written doc(s) reference the affected code and may need an implementation-accuracy re-verification:

• content/docs/ai/skills-reference.mdx(via packages/cli)
• content/docs/api/client-sdk.mdx(via @objectstack/cli)
• content/docs/api/data-flow.mdx(via @objectstack/cli)
• content/docs/api/environment-routing.mdx(via @objectstack/cli)
• content/docs/api/error-catalog.mdx(via @objectstack/cli)
• content/docs/automation/hook-bodies.mdx(via packages/cli)
• content/docs/getting-started/cli.mdx(via @objectstack/cli)
• content/docs/getting-started/quick-start.mdx(via @objectstack/cli)
• content/docs/kernel/runtime-services/data-service.mdx(via packages/cli)
• content/docs/kernel/runtime-services/index.mdx(via packages/cli)
• content/docs/permissions/authentication.mdx(via @objectstack/cli)
• content/docs/plugins/packages.mdx(via @objectstack/cli, @objectstack/plugin-dev)
• content/docs/protocol/objectos/plugin-spec.mdx(via @objectstack/cli)
• content/docs/protocol/objectos/realtime-protocol.mdx(via @objectstack/cli)
• content/docs/releases/implementation-status.mdx(via @objectstack/cli)

Advisory only. To re-verify, run the docs-accuracy-audit workflow scoped to these files:
node scripts/docs-audit/affected-docs.mjs origin/main → pass the list as args.docs.