Update environment configuration and enhance terminal tool integration

- Updated `.env.example` to include new API keys and configuration options for the mini-swe-agent backend, including support for local, Docker, and Modal environments.
- Added `.gitmodules` to include mini-swe-agent as a submodule for easier integration.
- Refactored `mini_swe_runner.py` to use the updated model format and default to OpenRouter for API calls.
- Enhanced `model_tools.py` to support the new terminal tool definitions and ensure compatibility with the mini-swe-agent backend.
- Updated `README.md` to reflect changes in setup instructions and environment variable configurations.
- Improved `terminal_tool.py` to manage execution environments and lifecycle, ensuring proper cleanup and error handling.
- Introduced `terminal_hecate.py` for executing commands on MorphCloud VMs, providing an alternative backend for terminal operations.

requirements.txt

@@ -1,10 +1,33 @@
-firecrawl-py
+# Core dependencies
 openai
-fal-client
-fire
-git@github.com:NousResearch/hecate.git
-tenacity
 python-dotenv
 fire
 httpx
 rich
+tenacity
+
+# Web tools
+firecrawl-py
+
+# Image generation
+fal-client
+
+# mini-swe-agent dependencies (for terminal tool)
+# Note: Install mini-swe-agent itself with: pip install -e ./mini-swe-agent
+pyyaml
+requests
+jinja2
+pydantic>=2.0
+litellm>=1.75.5
+typer
+platformdirs
+
+# Optional: For Docker backend (recommended)
+# Requires Docker installed and user in 'docker' group
+
+# Optional: For Modal backend (cloud execution)
+# modal
+# boto3
+
+# Optional: Legacy Hecate terminal backend
+# git+ssh://git@github.com/NousResearch/hecate.git