Fix bugs of message disappearing sometimes and being duplicate sometimes

CONTRIBUTING.md

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+# Contributing to ml-agent
+
+## Creating a Pull Request
+
+### 1. Create and work on your branch
+
+```bash
+# Create a new branch
+git checkout -b your-feature-branch
+
+# Make your changes, then commit
+git add .
+git commit -m "Your commit message"
+```
+
+### 2. Push your branch to keep changes backed up
+
+```bash
+# First time pushing this branch
+git push --set-upstream origin your-feature-branch
+
+# Subsequent pushes
+git push
+```
+
+### 3. When ready, create a Pull Request
+
+```bash
+# Easy way: Use the helper script
+./create-pr.sh "Your PR title" "Optional description"
+
+# This automatically:
+# - Gets your current branch
+# - Creates the PR
+# - Pushes your changes to it
+```
+
+### Example workflow
+
+```bash
+# 1. Create branch
+git checkout -b fix-bug-123
+
+# 2. Make changes and commit
+git add backend/main.py
+git commit -m "Fix authentication bug"
+
+# 3. Push to keep changes safe
+git push --set-upstream origin fix-bug-123
+
+# 4. Continue working...
+git add frontend/src/App.tsx
+git commit -m "Update UI"
+git push
+
+# 5. When ready, create PR
+./create-pr.sh "Fix authentication bug" "Fixes issue where users could not authenticate in dev mode"
+```
+
+## Development Setup
+
+### Running locally with hot-reload
+
+**Backend:**
+```bash
+cd backend
+uv run uvicorn main:app --host 0.0.0.0 --port 7860 --reload
+```
+
+**Frontend** (in a separate terminal):
+```bash
+cd frontend
+npm run dev
+```
+
+Access the app at http://localhost:5173
+
+### Environment Variables
+
+Make sure your `.env` file in the project root contains:
+```
+ANTHROPIC_API_KEY=your_key_here
+HF_TOKEN=your_hf_token_here
+GITHUB_TOKEN=your_github_token_here
+HF_NAMESPACE=your_namespace_here
+```