Merge remote-tracking branch 'origin/master' into worktree/web-model-request-retry

# Conflicts:
#	packages/client/runtime/README.i18n.yaml
#	packages/client/runtime/src/client/index.ts
#	packages/client/runtime/src/client/sessions/conversation.ts
#	packages/client/runtime/src/client/sessions/session.ts
#	packages/client/ui-conversation/README.i18n.yaml
#	packages/client/ui-conversation/src/client/chat/MessageItem.tsx
#	packages/client/ui-conversation/tests/chat-branch-tails.spec.tsx

packages/client/runtime/tests/event-script.ts

@@ -56,6 +56,8 @@ export const ev = {
     }),
   turnEnd: (seq: number, turn: number, reason: 'completed' | 'cancelled' = 'completed'): SessionEvent =>
     at(seq, { type: 'turn/end', data: { turn, reason: { kind: reason } } }),
+  todoWrite: (seq: number, todos: { content: string; status: 'pending' | 'in_progress' | 'completed' }[]): SessionEvent =>
+    at(seq, { type: 'todo/write', data: { todos } }),
 }
 
 /** One complete plain turn (turn/start → user → step → assistant → turn/end), 6 events from startSeq. */