fix: remove backend placeholders

README.md

@@ -36,7 +36,7 @@ cd frontend && npm install && npm run dev
 # → http://localhost:3000
 ```
 
-**Frontend + backend** (so the app can show “Backend API: N todos”):
+**Frontend + backend** (for AI agent and health):
 
 ```bash
 # Terminal 1 – backend
@@ -45,7 +45,7 @@ cd backend && npm install && npm run dev
 
 # Terminal 2 – frontend
 cd frontend && npm install && npm run dev
-# → http://localhost:3000 (Vite proxies /api/todos to backend)
+# → http://localhost:3000 (Vite proxies /api/* and /health to backend)
 ```
 
 ---
@@ -89,16 +89,9 @@ For self-hosting (e.g. Tailscale/HTTPS): set `CORS_ORIGIN` to your frontend URL;
 
 | Method | Path | Description |
 |--------|------|-------------|
-| GET    | `/api/todos`     | List all todos. |
-| GET    | `/api/todos/:id` | Get one todo. |
-| POST   | `/api/todos`     | Create (`{ "title": "...", "completed": false }`). |
-| PUT    | `/api/todos/:id` | Update. |
-| DELETE | `/api/todos/:id` | Delete. |
 | GET    | `/health`        | Health check (e.g. for Docker). |
 | POST   | `/api/agent`     | Run AI agent; body `{ "prompt", "context?", "contextNodes?" }` → `{ "markdown" }`. |
 
-Data is in-memory (resets on restart). Add a JSON file or DB later if needed.
-
 ---
 
 ## Agent node (local LLM or OpenAI)