refactor: identify and freeze messages at creation

packages/core/agent/tests/agent.spec.ts

@@ -3,7 +3,6 @@ import { Context, Service, symbols } from 'cordis'
 import type { Events } from 'cordis'
 import { Session, SessionId } from '@deepseek-ai/dsh-session'
 import AgentRegistry, {
-  AgentMessageId,
   agentEvents,
 } from '@deepseek-ai/dsh-agent'
 
@@ -24,10 +23,10 @@ function stubAgent(rawId: string, overrides: Partial<Agent> = {}): Agent {
     status: 'idle',
     acceptsNextStep: false,
     ctx: new Context(),
-    send: () => AgentMessageId('stub'),
-    followup: () => AgentMessageId('stub'),
-    steer: () => AgentMessageId('stub'),
-    inject: () => AgentMessageId('stub'),
+    send: () => {},
+    followup: () => {},
+    steer: () => {},
+    inject: () => {},
     cancel() {},
     whenIdle() { return Promise.resolve() },
   }

packages/core/agent/tests/invariant.spec.ts

@@ -1,6 +1,7 @@
+import { freezeMessage, MessageId } from '@deepseek-ai/dsh-llm'
 import { describe, expect, it } from 'vitest'
 import { Context } from 'cordis'
-import { AgentMessageId, type Agent } from '@deepseek-ai/dsh-agent'
+import { type Agent } from '@deepseek-ai/dsh-agent'
 import * as AgentInvariant from '@deepseek-ai/dsh-agent/invariant'
 import { scopeTarget } from '@deepseek-ai/dsh-scope'
 import InvariantService from '@deepseek-ai/dsh-invariants'
@@ -45,7 +46,12 @@ describe('agent status invariants', () => {
 })
 
 describe('agent inbox invariants', () => {
-  const info = () => ({ id: AgentMessageId('m'), content: [], source: { kind: 'user' as const } })
+  const info = () => freezeMessage({
+    id: MessageId('m'),
+    role: 'user' as const,
+    content: [],
+    source: { kind: 'user' as const },
+  })
 
   it('accepts a dequeue and a discard covered by prior enqueues', async () => {
     const ctx = await setup()