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.

apps/cli/tests/args.spec.ts

@@ -44,8 +44,8 @@ describe('parseDshArgs', () => {
       .toEqual({ mode: 'plugin', profile: 'tui', args: ['add', 'turtle-ui'] })
     expect(parse(['plugin', '--profile', 'tui', 'remove', 'turtle-ui']))
       .toEqual({ mode: 'plugin', profile: 'tui', args: ['remove', 'turtle-ui'] })
-    expect(parse(['plugin', '--profile', 'tui', 'why', 'cordis']))
-      .toEqual({ mode: 'plugin', profile: 'tui', args: ['why', 'cordis'] })
+    expect(parse(['plugin', '--profile', 'tui', 'why', '@deepseek-ai/cordis']))
+      .toEqual({ mode: 'plugin', profile: 'tui', args: ['why', '@deepseek-ai/cordis'] })
     // Unknown pnpm flags forward verbatim.
     expect(parse(['plugin', '--profile', 'tui', 'add', '--save-dev', 'x']))
       .toEqual({ mode: 'plugin', profile: 'tui', args: ['add', '--save-dev', 'x'] })