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.

packages/client/connection/src/client/index.ts

@@ -3,7 +3,7 @@
  * the shared API client, and lets the runtime object layer start the stream
  * controller with its sinks.
  */
-import type { Context } from 'cordis'
+import type { Context } from '@deepseek-ai/cordis'
 import type { IApiClient } from './api.ts'
 import { ConnectionController, type ConnectionConfig, type ConnectionSinks, type ConnectionState } from './connection.ts'
 import { FixtureApiClient } from './fixture.ts'

packages/client/connection/src/index.ts

@@ -1,6 +1,6 @@
 /** Host HTTP bridge for browser-client RPC. */
-import type { Context } from 'cordis'
-import z from 'schemastery'
+import type { Context } from '@deepseek-ai/cordis'
+import z from '@deepseek-ai/schemastery'
 import type {} from '@deepseek-ai/dsh-attachment'
 // Activates the httpServer Context merge used below.
 import type { WebRoute, WebUpgradeRoute } from '@deepseek-ai/dsh-host-webserver'

packages/client/connection/src/invariant.ts

@@ -4,7 +4,7 @@
  */
 
 /* jscpd:ignore-start */
-import type { Context } from 'cordis'
+import type { Context } from '@deepseek-ai/cordis'
 import type { InvariantInstaller } from '@deepseek-ai/dsh-invariants'
 
 const PACKAGE_NAME = '@deepseek-ai/dsh-client-connection'

packages/client/connection/src/rpc-host.ts

@@ -1,6 +1,6 @@
 /** Host registry and HTTP adapter for generic Connection RPC channels. */
 
-import { Context, Service } from 'cordis'
+import { Context, Service } from '@deepseek-ai/cordis'
 import type { WebRoute } from '@deepseek-ai/dsh-host-webserver'
 import {
   clientRequestSchema,
@@ -32,7 +32,7 @@ interface ConnectionRpcInterceptor {
   readonly options: ConnectionRpcHandlerOptions
 }
 
-declare module 'cordis' {
+declare module '@deepseek-ai/cordis' {
   interface Context {
     /** Host Connection transport and RPC registrations. */
     connection: HostConnectionHandle