Merge remote-tracking branch 'origin/master' into worktree/preset-plane-fallout-p1

The vendored Cordis rescope (`cordis` -> `@deepseek-ai/cordis`,
`@cordisjs/plugin-*` -> `@deepseek-ai/cordis-plugin-*`) collided with this
branch's two added edges. Resolved by taking master's package names and
keeping this branch's additions: `@deepseek-ai/dsh-agent` and
`@deepseek-ai/dsh-system-prompt` peers, the `scopeChainOf` import, and the
`agent/created` type-only edge.

`docs/event-producer-consumer.*` is generated; regenerated after the merge
rather than hand-resolved.

packages/core/tools/src/index.ts

@@ -4,8 +4,8 @@
  * @module @deepseek-ai/dsh-tools
  */
 
-import { Context, Service } from 'cordis'
-import z from 'schemastery'
+import { Context, Service } from '@deepseek-ai/cordis'
+import z from '@deepseek-ai/schemastery'
 import { AnonymousEntries, NamedEntries, ScopedLayers, scopeOf, scopeTarget } from '@deepseek-ai/dsh-scope'
 import type { ScopeKey, ScopeLayer, Scoped } from '@deepseek-ai/dsh-scope'
 import type { CallId, ContentBlock, ToolSchema } from '@deepseek-ai/dsh-llm'
@@ -120,7 +120,7 @@ export type {
   WebSource,
 } from './presentation.ts'
 
-declare module 'cordis' {
+declare module '@deepseek-ai/cordis' {
   interface Context {
     tools: ToolRegistry
   }

packages/core/tools/src/invariant.ts

@@ -1,6 +1,6 @@
 /** Package-owned tool-pipeline invariants. @module @deepseek-ai/dsh-tools/invariant */
 
-import type { Context } from 'cordis'
+import type { Context } from '@deepseek-ai/cordis'
 import type { Session, SessionEvent } from '@deepseek-ai/dsh-session'
 import type { InvariantFailure, InvariantInstaller } from '@deepseek-ai/dsh-invariants'
 import type { ToolExecution, ToolExecutionResult } from './index.ts'