Merge remote-tracking branch 'github/master' into xtr/trajectory-inspection-ui

# Conflicts:
#	packages/client/runtime/src/client/sessions/fold-adapter.ts
#	packages/compact/compact-basic/src/summarizer.ts

apps/web/tests/snapshots/live-interactions/error-auth.expected.md

@@ -1,18 +1,24 @@
 - banner:
   - navigation "Session hierarchy":
     - button "Reply with a one-sentence description" [disabled]
-    - text: · 1 turns
   - tablist:
     - tab "Chat" [selected]
     - tab "Trajectory"
 - text: Reply with a one-sentence description of event sourcing, then stop.
+- button "复制":
+  - img
+- button "在新对话中分支":
+  - img
+- button "编辑":
+  - img
+- button "▸ 上下文注入"
 - textbox "Message the agent"
 - button "Add attachment":
   - img
 - combobox "Access mode":
   - option "Read-only" [selected]
   - option "Read-write"
-- button "选择模型，当前 deepseek-v4-flash":
-  - text: deepseek-v4-flash
+- button "选择模型，当前 DeepSeek-V4-Flash":
+  - text: DeepSeek-V4-Flash
   - img
 - button "Send message" [disabled]