Add Deep Agents UI, pipeline fixes, and agent improvements.

Includes deep-agents-ui integration, rework detection via Gitea,
tool-call sanitization fixes, and startup scripts.

deep-agents-ui/src/providers/ChatProvider.tsx

@@ -0,0 +1,37 @@
+"use client";
+
+import { ReactNode, createContext, useContext } from "react";
+import { Assistant } from "@langchain/langgraph-sdk";
+import { type StateType, useChat } from "@/app/hooks/useChat";
+import type { UseStreamThread } from "@langchain/langgraph-sdk/react";
+
+interface ChatProviderProps {
+  children: ReactNode;
+  activeAssistant: Assistant | null;
+  onHistoryRevalidate?: () => void;
+  thread?: UseStreamThread<StateType>;
+}
+
+export function ChatProvider({
+  children,
+  activeAssistant,
+  onHistoryRevalidate,
+  thread,
+}: ChatProviderProps) {
+  const chat = useChat({ activeAssistant, onHistoryRevalidate, thread });
+  return <ChatContext.Provider value={chat}>{children}</ChatContext.Provider>;
+}
+
+export type ChatContextType = ReturnType<typeof useChat>;
+
+export const ChatContext = createContext<ChatContextType | undefined>(
+  undefined
+);
+
+export function useChatContext() {
+  const context = useContext(ChatContext);
+  if (context === undefined) {
+    throw new Error("useChatContext must be used within a ChatProvider");
+  }
+  return context;
+}