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/scaffold/helper/src/plugins/local-plugin-blueprint.ts

@@ -83,7 +83,7 @@ export class LocalPluginBlueprint {
   documents(projectName: string, releaseVersion: string): TextProjectFile[] {
     const name = this.packageName(projectName)
     const toolName = this.name.replaceAll('-', '_')
-    const cordisSpec = resolveNpmDependency('cordis', 'devDependencies', releaseVersion).spec
+    const cordisSpec = resolveNpmDependency('@deepseek-ai/cordis', 'devDependencies', releaseVersion).spec
     const manifest = {
       name,
       version: '0.0.0',
@@ -94,10 +94,10 @@ export class LocalPluginBlueprint {
       exports: { '.': { types: './lib/index.d.ts', default: './lib/index.js' } },
       peerDependencies: {
         ...this.kind === 'tool' ? { '@deepseek-ai/dsh-tools': `^${releaseVersion}` } : {},
-        cordis: cordisSpec,
+        '@deepseek-ai/cordis': cordisSpec,
       },
       devDependencies: {
-        cordis: cordisSpec,
+        '@deepseek-ai/cordis': cordisSpec,
       },
     }
     const tsconfig = {