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.

scripts/gen-cordis-catalog-partition.spec.ts

@@ -128,7 +128,7 @@ describe('cordis-walk scan reach', () => {
     const dir = join(root, 'packages/client/ui-x/src/client')
     mkdirSync(dir, { recursive: true })
     writeFileSync(join(dir, 'index.ts'), [
-      "declare module 'cordis' {",
+      "declare module '@deepseek-ai/cordis' {",
       '  interface Events {',
       "    'x/changed'(): void",
       '  }',
@@ -153,12 +153,12 @@ describe('cordis-walk scan reach', () => {
     // backstop must not stop at the first one, skip the double-quoted legal
     // form, or ignore .tsx sources.
     writeFileSync(join(dir, 'split.ts'), [
-      "declare module 'cordis' {",
+      "declare module '@deepseek-ai/cordis' {",
       '  interface Context {',
       '    first: FirstService',
       '  }',
       '}',
-      'declare module "cordis" {',
+      'declare module "@deepseek-ai/cordis" {',
       '  interface Events {',
       "    'second/changed'(): void",
       '  }',
@@ -167,7 +167,7 @@ describe('cordis-walk scan reach', () => {
       '',
     ].join('\n'))
     writeFileSync(join(dir, 'view.tsx'), [
-      "declare module 'cordis' {",
+      "declare module '@deepseek-ai/cordis' {",
       '  interface Context {',
       '    fromTsx: TsxService',
       '  }',
@@ -189,7 +189,7 @@ describe('cordis-walk scan reach', () => {
 
   it('reads string-literal and identifier member names from an Events merge', () => {
     const sf = ts.createSourceFile('x.ts', [
-      "declare module 'cordis' {",
+      "declare module '@deepseek-ai/cordis' {",
       '  interface Events {',
       "    'scope/list'(items: string[]): void",
       '    plain(): void',