重构 director subagents 为 Codex custom agents

README.md

@@ -5,7 +5,7 @@ This repository is the minimal starting framework for a Codex plugin.
 Current state:
 
 - Skills: `/brainstorm`
-- Agents: `creative-director`, `art-director`, `technical-director`, `producer`
+- Codex custom agents: `creative-director`, `art-director`, `technical-director`, `producer`
 - Assets: `codex-game-studio.svg`
 - References: `director-gates.md`, `templates/game-concept.md`
 - Standards: `design-docs.md`
@@ -16,6 +16,15 @@ Current state:
 - No MCP servers
 - No app integrations
 
+The director agents are pre-defined Codex custom agents stored in:
+
+```text
+.codex/agents/
+```
+
+Each custom agent is a standalone TOML file with `name`, `description`, and
+`developer_instructions`, matching the Codex subagents documentation.
+
 The only required plugin manifest is:
 
 ```text