重构插件入口与runtime安装流程

skills/using-codex-game-studios/SKILL.md

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+---
+name: using-codex-game-studios
+description: "Use when a user asks how the Codex Game Studios plugin is structured, what workflow to run next, how to initialize it, or how it differs from generic development workflow plugins."
+---
+
+# Using Codex Game Studios
+
+Codex Game Studios is a game-production plugin built around plugin-discovered skills, not global `~/.codex/skills` bridge folders.
+
+## Entry Points
+
+- Use `$setup-runtime` when a project needs the bundled director agents installed into `.codex/agents/`.
+- Use `$brainstorm` to turn a rough game idea into `design/gdd/game-concept.md`.
+- Use `runtime/agents/` as the plugin source of bundled custom agents.
+- Use `references/` and `standards/` only when the active workflow points to them.
+
+## Design Rule
+
+Do not rely on a global `~/.codex/skills/codex-game-studio` bridge. The installed plugin exposes its skills through `.codex-plugin/plugin.json` with `"skills": "./skills/"`, matching the normal Codex plugin layout.

skills/using-codex-game-studios/agents/openai.yaml

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+interface:
+  display_name: "Using Codex Game Studios"
+  short_description: "Understand the game-studio plugin workflow"
+  default_prompt: "Use $using-codex-game-studios to explain this plugin workflow."