feat: migrate chat orchestration to deep langgraph workers

app/agents/note_agent.py

@@ -2,17 +2,14 @@
 
 from __future__ import annotations
 
-import json
 from typing import Any
 
-from langchain_core.messages import HumanMessage, SystemMessage
 from langchain_core.tools import tool
 
-from app.core.agent_registry import ChatAgent, registry
-from app.core.llm import embed, get_llm
+from app.core.llm import embed
 from app.core.ws_context import execute_on_client
 
-_SYSTEM_PROMPT = (
+NOTE_SYSTEM_PROMPT = (
     "You are a note-taking assistant. You help users create, retrieve, update,\n"
     "and delete Markdown notes in their workspace.\n\n"
     "Rules:\n"
@@ -122,23 +119,10 @@ async def delete_note(note_id: str) -> str:
     return f"Note {note_id} deleted."
 
 
-@registry.register
-class NoteAgent(ChatAgent):
-    def get_name(self) -> str:
-        return "note_agent"
-
-    def get_description(self) -> str:
-        return "Manages notes: list, get, create, update, delete"
-
-    def get_tools(self) -> list[Any]:
-        return [list_notes, get_note, create_note, update_note, delete_note]
-
-    async def handle(self, query: str, context: dict[str, Any]) -> str:
-        llm = get_llm()
-        messages = [
-            SystemMessage(content=_SYSTEM_PROMPT),
-            HumanMessage(
-                content=f"User query: {query}\nContext: {json.dumps(context)[:1000]}"
-            ),
-        ]
-        return await self._tool_loop(llm, messages, self.get_tools())
+NOTE_TOOLS: list[Any] = [
+    list_notes,
+    get_note,
+    create_note,
+    update_note,
+    delete_note,
+]