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/session/session-title/tests/invariant.spec.ts

@@ -1,7 +1,7 @@
 // Title-source invariant: `messageSeqs` is empty iff `source.kind` is `user`.
 // — the durable relationship every appended session/title event must keep.
 import { describe, expect, it } from 'vitest'
-import { Context } from 'cordis'
+import { Context } from '@deepseek-ai/cordis'
 import * as SessionTitleInvariantCompanion from '@deepseek-ai/dsh-session-title/invariant'
 import InvariantService, { InvariantError } from '@deepseek-ai/dsh-invariants'
 import SessionStore, { SessionId } from '@deepseek-ai/dsh-session'

packages/session/session-title/tests/persistence.spec.ts

@@ -1,6 +1,6 @@
 import { createUserMessage } from '@deepseek-ai/dsh-llm'
 import { afterEach, describe, expect, it } from 'vitest'
-import { Context } from 'cordis'
+import { Context } from '@deepseek-ai/cordis'
 import { mkdtemp, rm } from 'node:fs/promises'
 import { tmpdir } from 'node:os'
 import { join } from 'node:path'

packages/session/session-title/tests/projection.spec.ts

@@ -10,7 +10,7 @@
  */
 
 import { describe, expect, it } from 'vitest'
-import { Context } from 'cordis'
+import { Context } from '@deepseek-ai/cordis'
 import SessionStore, { SessionId } from '@deepseek-ai/dsh-session'
 import type { Session } from '@deepseek-ai/dsh-session'
 import SessionProjectionRegistry from '@deepseek-ai/dsh-session-projection'

packages/session/session-title/tests/provider.spec.ts

@@ -1,4 +1,4 @@
-import { Context } from 'cordis'
+import { Context } from '@deepseek-ai/cordis'
 import { describe, expect, it, vi } from 'vitest'
 import LlmService, { createUserMessage, deepFreeze, markAgentLoopRequest  } from '@deepseek-ai/dsh-llm'
 import SessionStore, { SessionId } from '@deepseek-ai/dsh-session'

packages/session/session-title/tests/rename.spec.ts

@@ -1,7 +1,7 @@
 // SessionTitleService.rename: user-source acceptance, normalization/rejection
 // boundaries, and the pin (a user-sourced latest title schedules no automatic
 // revision; explicit refresh stays the unpin).
-import { Context } from 'cordis'
+import { Context } from '@deepseek-ai/cordis'
 import { describe, expect, it, vi } from 'vitest'
 import { createUserMessage } from '@deepseek-ai/dsh-llm'
 import SessionStore, { Session, SessionId } from '@deepseek-ai/dsh-session'

packages/session/session-title/tests/service-contracts.spec.ts

@@ -1,5 +1,5 @@
 import { createUserMessage } from '@deepseek-ai/dsh-llm'
-import { Context, type Fiber } from 'cordis'
+import { Context, type Fiber } from '@deepseek-ai/cordis'
 import { describe, expect, it, vi } from 'vitest'
 import SessionStore, { Session, SessionId } from '@deepseek-ai/dsh-session'
 import SessionTitleService, {

packages/session/session-title/tests/session-title.spec.ts

@@ -1,5 +1,5 @@
 import { createUserMessage } from '@deepseek-ai/dsh-llm'
-import { Context } from 'cordis'
+import { Context } from '@deepseek-ai/cordis'
 import { describe, expect, it } from 'vitest'
 import SessionStore, { Session, SessionId } from '@deepseek-ai/dsh-session'
 import SessionTitleService, {