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/code-runtime/code-runtime-worker/tests/built-lib.e2e.ts

@@ -18,7 +18,7 @@ const built = ['lib/index.js', 'lib/worker.cjs'].every(file => existsSync(join(p
 describe.skipIf(!built)('built lib real load path (plain node)', () => {
   it('runs a TypeScript program with a binding through lib/index.js and its lib/worker.cjs entry', async () => {
     const script = `
-      const { Context } = await import('cordis')
+      const { Context } = await import('@deepseek-ai/cordis')
       const { WorkerCodeRuntime } = await import('@deepseek-ai/dsh-code-runtime-worker')
       const ctx = new Context()
       await ctx.plugin(WorkerCodeRuntime, {})

packages/code-runtime/code-runtime-worker/tests/runtime.spec.ts

@@ -1,5 +1,5 @@
 import { describe, expect, it } from 'vitest'
-import { Context } from 'cordis'
+import { Context } from '@deepseek-ai/cordis'
 import { WorkerCodeRuntime } from '@deepseek-ai/dsh-code-runtime-worker'
 import type { Config } from '@deepseek-ai/dsh-code-runtime-worker'
 import type { CodeBindingFunction, CodeBindingNamespace, CodeRunResult } from '@deepseek-ai/dsh-code-runtime'