Add browser automation tools and enhance environment configuration

- Introduced new browser automation tools in `browser_tool.py` for navigating, interacting with, and extracting content from web pages using the agent-browser CLI and Browserbase cloud execution.
- Updated `.env.example` to include new configuration options for Browserbase API keys and session settings.
- Enhanced `model_tools.py` and `toolsets.py` to integrate browser tools into the existing tool framework, ensuring consistent access across toolsets.
- Updated `README.md` with setup instructions for browser tools and their usage examples.
- Added new test script `test_modal_terminal.py` to validate Modal terminal backend functionality.
- Improved `run_agent.py` to support browser tool integration and logging enhancements for better tracking of API responses.

toolsets.py

@@ -33,10 +33,16 @@ TOOLSETS = {
     # Basic toolsets - individual tool categories
     "web": {
         "description": "Web research and content extraction tools",
-        "tools": ["web_search", "web_extract", "web_crawl"],
+        "tools": ["web_search", "web_extract"],
         "includes": []  # No other toolsets included
     },
     
+    "search": {
+        "description": "Web search only (no content extraction/scraping)",
+        "tools": ["web_search"],
+        "includes": []
+    },
+    
     "vision": {
         "description": "Image analysis and vision tools",
         "tools": ["vision_analyze"],
@@ -61,6 +67,17 @@ TOOLSETS = {
         "includes": []
     },
     
+    "browser": {
+        "description": "Browser automation for web interaction (navigate, click, type, scroll, iframes, hold-click) with web search for finding URLs",
+        "tools": [
+            "browser_navigate", "browser_snapshot", "browser_click",
+            "browser_type", "browser_scroll", "browser_back",
+            "browser_press", "browser_close", "browser_get_images",
+            "browser_vision", "web_search"
+        ],
+        "includes": []
+    },
+    
     # Scenario-specific toolsets
     
     "debugging": {