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.

vendor/loader/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "@cordisjs/plugin-loader",
+  "name": "@deepseek-ai/cordis-plugin-loader",
   "description": "Plugin loader for cordis",
   "version": "1.0.0-rc.5",
   "private": true,
@@ -23,7 +23,7 @@
   "author": "Shigma <shigma10826@gmail.com>",
   "license": "MIT",
   "peerDependencies": {
-    "cordis": "^4.0.0-rc.7",
+    "@deepseek-ai/cordis": "^4.0.0-rc.7",
     "node-addon-require-builtin": "^0.1.4"
   },
   "peerDependenciesMeta": {
@@ -32,6 +32,6 @@
     }
   },
   "dependencies": {
-    "cosmokit": "^1.8.1"
+    "@deepseek-ai/cosmokit": "^1.8.1"
   }
 }