kernel自动生成

简述

读取一个 Kernel 的清单（manifest）与源码。

One Kernel’s manifest and source.

{"id": 1, "op": "kernel"}

名称	类型	必需	说明
`kernel`	`string`	否	the Kernel’s id, `name@version`; else `id` names it
`generation`	`integer`	否	one the session remembers (a document of the scene as a change loaded it or a compose wrote it); the current when not given

manifest, generation, source, as publish takes it