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/cordis-primer.zh.md

@@ -39,7 +39,7 @@ Cordis 是 DeepSeek Harness SDK 底层以 vendor 方式引入的插件框架。
 
 ## Loader 配置
 
-`@cordisjs/plugin-include` 将 `!!js` 解析为表达式节点，但 Loader 仅在挂载插件前对条目的 `config` 做插值。条目元数据（`id`、`name`、`group`、`disabled`、`inject`、`intercept` 和 `isolate`）保持字面值；因此 `disabled: !!js ...` 是一个 truthy 对象，会始终禁用该条目。需要根据环境选择挂载哪些插件时，请使用显式的配置覆盖层。
+`@deepseek-ai/cordis-plugin-include` 将 `!!js` 解析为表达式节点，但 Loader 仅在挂载插件前对条目的 `config` 做插值。条目元数据（`id`、`name`、`group`、`disabled`、`inject`、`intercept` 和 `isolate`）保持字面值；因此 `disabled: !!js ...` 是一个 truthy 对象，会始终禁用该条目。需要根据环境选择挂载哪些插件时，请使用显式的配置覆盖层。
 
 ## 实践规则