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/project/npm-dependency-policy.ts

@@ -19,17 +19,17 @@ export interface BaselineNpmDependencies {
 }
 
 const EXTERNAL_NPM_DEPENDENCY_SPECS: Readonly<Record<string, string>> = {
-  '@cordisjs/plugin-hmr': '^1.0.15',
-  '@cordisjs/plugin-timer': '^1.1.2',
+  '@deepseek-ai/cordis-plugin-hmr': '^1.0.15',
+  '@deepseek-ai/cordis-plugin-timer': '^1.1.2',
   '@types/node': '^22.20.0',
-  cordis: '^4.0.0-rc.7',
+  '@deepseek-ai/cordis': '^4.0.0-rc.7',
   tsdown: '0.22.2',
   tsx: '^4.22.4',
   typescript: '^6.0.3',
 }
 
 const BASELINE_NPM_DEPENDENCY_NAMES: Readonly<Record<NpmDependencySection, readonly string[]>> = {
-  dependencies: ['@deepseek-ai/dsh-scripts', 'cordis'],
+  dependencies: ['@deepseek-ai/dsh-scripts', '@deepseek-ai/cordis'],
   devDependencies: ['@types/node', 'tsdown', 'tsx', 'typescript'],
 }