feat: add browser automation tool using Vercel agent-browser

- Add src/tools/browser.rs with BrowserTool implementation
- Wraps agent-browser CLI for AI-optimized web browsing
- Supports: open, snapshot, click, fill, type, screenshot, wait, etc.
- Uses refs (@e1, @e2) from accessibility snapshots for precise element selection
- JSON output mode for LLM integration
- Security: allowlist-only domains, blocks private/local hosts
- Add session_name to BrowserConfig for persistent sessions
- Register BrowserTool in tools/mod.rs alongside BrowserOpenTool

All tests pass.

docker-compose.yml

@@ -0,0 +1,48 @@
+# ZeroClaw Docker Compose Example
+# 
+# Quick start:
+#   1. Copy this file and set your API key
+#   2. Run: docker-compose up -d
+#   3. Access gateway at http://localhost:3000
+#
+# For more info: https://github.com/theonlyhennygod/zeroclaw
+
+services:
+  zeroclaw:
+    image: zeroclaw/zeroclaw:latest
+    # Or build locally:
+    # build: .
+    container_name: zeroclaw
+    restart: unless-stopped
+    
+    environment:
+      # Required: Your LLM provider API key
+      - API_KEY=${API_KEY:-}
+      # Or use the prefixed version:
+      # - ZEROCLAW_API_KEY=${ZEROCLAW_API_KEY:-}
+      
+      # Optional: LLM provider (default: openrouter)
+      # Options: openrouter, openai, anthropic, ollama
+      - PROVIDER=${PROVIDER:-openrouter}
+      
+      # Optional: Model override
+      # - ZEROCLAW_MODEL=anthropic/claude-sonnet-4-20250514
+      
+    volumes:
+      # Persist workspace and config
+      - zeroclaw-data:/data
+      
+    ports:
+      # Gateway API port
+      - "3000:3000"
+    
+    # Health check
+    healthcheck:
+      test: ["CMD", "zeroclaw", "doctor"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 10s
+
+volumes:
+  zeroclaw-data: