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.

tsconfig.base.json

@@ -28,15 +28,15 @@
     // not declaration path aliases, keep each package/vendor source compiled
     // under its own tsconfig boundary.
     "paths": {
-      "cordis": ["./vendor/cordis/src"],
-      "cosmokit": ["./vendor/cosmokit/src"],
-      "schemastery": ["./vendor/schemastery/src"],
-      "@cordisjs/plugin-loader": ["./vendor/loader/src"],
-      "@cordisjs/plugin-include": ["./vendor/include/src"],
-      "@cordisjs/plugin-group": ["./vendor/group/src"],
-      "@cordisjs/plugin-timer": ["./vendor/timer/src"],
-      "@cordisjs/plugin-hmr": ["./vendor/hmr/src"],
-      "@cordisjs/plugin-logger-console": ["./vendor/logger-console/src"],
+      "@deepseek-ai/cordis": ["./vendor/cordis/src"],
+      "@deepseek-ai/cosmokit": ["./vendor/cosmokit/src"],
+      "@deepseek-ai/schemastery": ["./vendor/schemastery/src"],
+      "@deepseek-ai/cordis-plugin-loader": ["./vendor/loader/src"],
+      "@deepseek-ai/cordis-plugin-include": ["./vendor/include/src"],
+      "@deepseek-ai/cordis-plugin-group": ["./vendor/group/src"],
+      "@deepseek-ai/cordis-plugin-timer": ["./vendor/timer/src"],
+      "@deepseek-ai/cordis-plugin-hmr": ["./vendor/hmr/src"],
+      "@deepseek-ai/cordis-plugin-logger-console": ["./vendor/logger-console/src"],
       "@deepseek-ai/node-addon-landlock-run": ["./native/landlock-run/packages/entry/src/index.ts"],
       "@deepseek-ai/dsh-invariants": ["./packages/support/invariants/src/index.ts"],
       "@deepseek-ai/dsh-typert-registry": ["./packages/typert/registry/src/index.ts"],