feat(session)!: embed assistant streams in format v2

packages/context/session-reference/tests/session-reference.spec.ts

@@ -83,6 +83,7 @@ function appendConversation(session: Session): void {
   const oldAssistant = session.append(
     'assistant/message',
     {
+      stream: [],
       turn: 1,
       step: 1,
       message: createMessage({
@@ -152,6 +153,7 @@ function appendConversation(session: Session): void {
   session.append(
     'assistant/message',
     {
+      stream: [],
       turn: 2,
       step: 1,
       message: createMessage({
@@ -190,6 +192,7 @@ function appendConversation(session: Session): void {
   session.append(
     'assistant/message',
     {
+      stream: [],
       turn: 2,
       step: 2,
       message: createMessage({
@@ -203,10 +206,16 @@ function appendConversation(session: Session): void {
     },
     { surfaceOp: 'append' },
   )
-  session.append('assistant/chunk', {
+  session.append('assistant/attempt', {
     turn: 2,
     step: 2,
-    chunk: { type: 'text-delta', index: 0, text: 'unfinished answer' },
+    stream: [{
+      type: 'text-chunks',
+      time0: 0,
+      index: 0,
+      dt: [],
+      texts: ['unfinished answer'],
+    }],
   })
 }
 
@@ -704,6 +713,7 @@ describe('session reference discovery and preparation', () => {
     source.append(
       'assistant/message',
       {
+        stream: [],
         turn: 3,
         step: 1,
         message: createMessage({
@@ -805,6 +815,7 @@ describe('session reference discovery and preparation', () => {
     const later = source.append(
       'assistant/message',
       {
+        stream: [],
         turn: 1,
         step: 1,
         message: createMessage({