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/subprocess/subprocess-local/tests/local.spec.ts

@@ -1,7 +1,7 @@
 import { PassThrough } from 'node:stream'
 import { describe, expect, it, vi } from 'vitest'
 import { basename, dirname, relative, resolve } from 'node:path'
-import { Context } from 'cordis'
+import { Context } from '@deepseek-ai/cordis'
 import LocalSubprocessService from '@deepseek-ai/dsh-subprocess-local'
 import type { SubprocessSpawnSpec, SubprocessTerminalHandle, SubprocessTerminalSpawnSpec } from '@deepseek-ai/dsh-subprocess'
 import { childEnv } from '../src/spawn.ts'

packages/subprocess/subprocess-local/tests/spawn.spec.ts

@@ -669,7 +669,7 @@ describe('tree-survivor escalation (terminate and bounded waits reach helpers th
   })
 
   it('service teardown awaits tree survivors, not just handle settlement', async () => {
-    const { Context } = await import('cordis')
+    const { Context } = await import('@deepseek-ai/cordis')
     const { default: LocalSubprocessService } = await import('@deepseek-ai/dsh-subprocess-local')
     const ctx = new Context()
     const fiber = await ctx.plugin(LocalSubprocessService)