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/mcp/mcp-client/tests/apply.spec.ts

@@ -3,7 +3,7 @@
  * Isolated file so vi.mock of the MCP SDK doesn't pollute other test suites.
  */
 import { describe, expect, it, vi, beforeEach } from 'vitest'
-import { Context } from 'cordis'
+import { Context } from '@deepseek-ai/cordis'
 import SystemPrompt from '@deepseek-ai/dsh-system-prompt'
 import ToolRegistry from '@deepseek-ai/dsh-tools'
 import type { Config } from '@deepseek-ai/dsh-mcp-client'

packages/mcp/mcp-client/tests/load-path.spec.ts

@@ -11,7 +11,7 @@
  */
 
 import { describe, expect, it } from 'vitest'
-import Loader from '@cordisjs/plugin-loader'
+import Loader from '@deepseek-ai/cordis-plugin-loader'
 import * as mcpClient from '@deepseek-ai/dsh-mcp-client'
 
 describe('dsh-mcp-client real-load-path guard', () => {

packages/mcp/mcp-client/tests/mcp-client.e2e.ts

@@ -14,7 +14,7 @@ import { tmpdir } from 'node:os'
 import { join } from 'node:path'
 import { fileURLToPath } from 'node:url'
 import { afterAll, beforeAll, describe, expect, it } from 'vitest'
-import { Context } from 'cordis'
+import { Context } from '@deepseek-ai/cordis'
 import { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js'
 import { StreamableHTTPServerTransport } from '@modelcontextprotocol/sdk/server/streamableHttp.js'
 import { z } from 'zod'

packages/mcp/mcp-client/tests/mcp-client.spec.ts

@@ -1,7 +1,7 @@
 import { describe, expect, it, vi, beforeEach } from 'vitest'
 import { Client } from '@modelcontextprotocol/sdk/client/index.js'
 import { InMemoryTransport } from '@modelcontextprotocol/sdk/inMemory.js'
-import { Context } from 'cordis'
+import { Context } from '@deepseek-ai/cordis'
 import { CallId } from '@deepseek-ai/dsh-llm'
 import SystemPrompt from '@deepseek-ai/dsh-system-prompt'
 import ToolRegistry, { type JsonValue } from '@deepseek-ai/dsh-tools'