refactor: identify and freeze messages at creation

packages/context/session-reference/src/index.ts

@@ -8,8 +8,9 @@
 import { Context, Service } from 'cordis'
 import z from 'schemastery'
 import type { Agent } from '@deepseek-ai/dsh-agent'
+import { createUserMessage } from '@deepseek-ai/dsh-llm'
 import type { ContentBlock } from '@deepseek-ai/dsh-llm'
-import type { SessionId, UserMessageData } from '@deepseek-ai/dsh-session'
+import type { SessionId, UserMessage } from '@deepseek-ai/dsh-session'
 import type { SessionSurfaceSnapshot } from '@deepseek-ai/dsh-session-query'
 import {
   DEFAULT_CANDIDATE_LIMIT,
@@ -192,10 +193,10 @@ export class SessionReferenceService extends Service {
         inputIndex: index,
       })),
     }
-    const additionalContext: UserMessageData = {
+    const additionalContext: UserMessage = createUserMessage({
       source,
       content: [{ type: 'text', text: prompt }],
-    }
+    })
     return { content: acceptedContent, additionalContext }
   }
 

packages/context/session-reference/src/projection.ts

@@ -45,13 +45,13 @@ function projectSessionConversation(snapshot: SessionSurfaceSnapshot): Projected
         break
       }
       case 'steering/message': {
-        if (event.data.source.kind !== 'user') break
-        const text = textContent(event.data.content)
+        if (event.data.message.source.kind !== 'user') break
+        const text = textContent(event.data.message.content)
         if (text !== '') conversation.push({ role: 'user', text, checkpoint: false, originalText: text, omittedBytes: 0 })
         break
       }
       case 'assistant/message': {
-        const text = textContent(event.data.content)
+        const text = textContent(event.data.message.content)
         if (text !== '') conversation.push({ role: 'assistant', text, checkpoint: false, originalText: text, omittedBytes: 0 })
         break
       }

packages/context/session-reference/src/types.ts

@@ -1,7 +1,7 @@
 /** Public session-reference request, candidate, and preparation records. */
 
 import type { ContentBlock } from '@deepseek-ai/dsh-llm'
-import type { SessionId, UserMessageData } from '@deepseek-ai/dsh-session'
+import type { SessionId, UserMessage } from '@deepseek-ai/dsh-session'
 
 /** Durable provenance for one prepared cross-session context. */
 export interface SessionReferenceSource {
@@ -52,7 +52,7 @@ export interface PreparedReferencedMessage {
   /** Readable message content after host mention tokens are removed. */
   content: ContentBlock[]
   /** Aggregated untrusted snapshot, absent when the message has no references. */
-  additionalContext?: UserMessageData
+  additionalContext?: UserMessage
 }
 
 /** Text-only projected conversation item. */