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/api-gateway.zh.md

@@ -17,7 +17,7 @@ Service 通常继承 `GatewayService`，让 Cordis service key 与默认 Remote
 ```ts
 import type { Agent } from '@deepseek-ai/dsh-agent'
 import { GatewayService, Remote, RemoteScope } from '@deepseek-ai/dsh-type-meta'
-import type { Context } from 'cordis'
+import type { Context } from '@deepseek-ai/cordis'
 
 export interface CreateGoalRequest {
   objective: string
@@ -60,7 +60,7 @@ Client 使用普通对象上的具体函数，不使用 JavaScript Proxy。直
 ```ts ignore-check
 import type { SessionId } from '@deepseek-ai/dsh-session/types'
 import type { AgentContext } from '@deepseek-ai/dsh-client-runtime/client'
-import type { Context } from 'cordis'
+import type { Context } from '@deepseek-ai/cordis'
 import type {} from '@deepseek-ai/dsh-api-remotes/client'
 
 export const inject = ['remote', 'remote.goals']