build(vendor): rescope the vendored Cordis packages into @deepseek-ai

Machine-produced by `pnpm run rescope-vendor --apply` plus the regeneration it
prints: `pnpm install` for the lockfile, `pnpm run gen-third-party-notices`,
`verify-translation-pairing --write` for the touched bilingual pairs,
`gen-doc-graphs`, and one typert snapshot whose ids embed character offsets.
`pnpm run rescope-vendor --check` verifies the result.

Renames nine vendored packages (cordis, cosmokit, schemastery and the six
@cordisjs plugins) and every reference that resolves them: manifest names and
dependency keys, module specifiers including declare-module merges, cordis.yml
plugin names, tsconfig paths, every Markdown fence, and `docs/` prose.
Directory names, upstream versions, and dependency ranges are unchanged, so
vendor/README.md still reads as an upstream snapshot; its manifest table gains
an upstream-name column so THIRD_PARTY_NOTICES keeps MIT attribution pointed
at each fork's origin.

The tutorial tier follows the rename end to end: its yaml fences named plugins
the Loader can no longer resolve, its `ts ignore-check` fences disagreed with
the compiled fences beside them, and its prose quoted both. The contracts that
told readers to keep upstream names — the root convention and the vendoring
cookbook's tree comment and manifest invariant — now say to rescope instead.

Two rules read `@deepseek-ai/` as "another workspace plugin": the client bundle
purity gate now names the vendored libraries a browser bundle inlines, and the
files where a bare `cordis` is an agent-preset id keep that product data.

docs/user/develop/framework/index.zh.md

@@ -80,7 +80,7 @@ export function apply(ctx: Context) {
 当你需要提前终止一个插件实例：
 
 ```ts
-import type { Context } from 'cordis'
+import type { Context } from '@deepseek-ai/cordis'
 
 declare const ctx: Context
 declare function myPlugin(ctx: Context): void
@@ -98,7 +98,7 @@ await fiber.dispose()
 
 ## HMR（热模块替换）
 
-通过 `cordis.yml` 加载 `@cordisjs/plugin-hmr` 后，修改插件源文件会触发：
+通过 `cordis.yml` 加载 `@deepseek-ai/cordis-plugin-hmr` 后，修改插件源文件会触发：
 
 1. 卸载旧插件（清理所有注册）
 2. 重新加载新代码