test(session-controller): restore Session type import

packages/api/session-controller/tests/session-cold.host.spec.ts

@@ -15,7 +15,7 @@ import TypertRegistry from '@deepseek-ai/dsh-typert-registry'
 import { createUserMessage, MessageId } from '@deepseek-ai/dsh-llm'
 import { snapshotSubagentDescriptor } from '@deepseek-ai/dsh-subagent'
 import type { Agent } from '@deepseek-ai/dsh-agent'
-import type { SessionEvent, SessionHeader, SessionId } from '@deepseek-ai/dsh-session'
+import type { Session, SessionEvent, SessionHeader, SessionId } from '@deepseek-ai/dsh-session'
 import type { SessionPromptRequest, SessionRequestId } from '../src/types.ts'
 import {
   SessionPersistenceRevision,