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/tsdown.client.ts

@@ -32,6 +32,14 @@ const CSS_VIRTUAL_SUFFIX = '.mjs'
  */
 export const INLINE_SAFE = /^@deepseek-ai\/dsh-(host-apiproxy|session|llm|tools|brand)(\/|$)/
 
+/**
+ * Vendored framework libraries: rescoped into @deepseek-ai, so the gate below
+ * would read them as plugin packages. They carry no cross-plugin runtime
+ * identity to share — the framework itself is a platform module (external),
+ * while these are ordinary libraries a browser bundle inlines.
+ */
+const VENDORED_LIBRARY = /^@deepseek-ai\/(cosmokit|schemastery)(\/|$)/
+
 /** Generated descriptor/codec contribution with no shared runtime identity. */
 const GENERATED_REMOTE = /^@deepseek-ai\/dsh-[a-z0-9]+(?:-[a-z0-9]+)*\/remote$/
 
@@ -208,6 +216,7 @@ function clientConfig(id: string, entry: string): UserConfig {
       resolveId(source: string) {
         if (!source.startsWith('@deepseek-ai/')) return null
         if (CLIENT_EXTERNALS.includes(source)) return null // platform module: external wins
+        if (VENDORED_LIBRARY.test(source)) return null // vendored library: inline, no shared identity
         if (INLINE_SAFE.test(source) || GENERATED_REMOTE.test(source)) return null // wire contribution: inline is the point
         throw new Error(
           `client bundle purity: "${source}" is not a platform module (CLIENT_EXTERNALS), an inline-safe wire layer, or a generated /remote contribution — `