Build a console

This would help influence the overall design in a way that is future proof for the extensions system, scripting, and a headless or CLI version of the Graphite editor. Like in Blender, if you click a button to do something, it will be shown in the console (helpful for API discoverability) and you can also type your own commands.

未指定文件、测试或入口点。首先梳理现有的扩展、脚本功能和 headless/CLI 架构，然后检查 Blender 风格的命令控制台如何适配编辑器。在实现之前，定义控制台的范围，以及针对 UI 操作发出的命令和用户输入的命令的验收标准。

由索引模型根据 Issue 内容生成。