feat: add Brave Search MCP, disable unused MCP servers

- Add brave_search MCP with wrapper script for API key
- Disable duckduckgo (rate limiting issues)
- Disable playwright, commands, codemcp to reduce prompt size
- Update context window settings for Llama-3.1-8B

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

run-brave-search-mcp.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+# Wrapper script to run Brave Search MCP server with environment variables
+set -a
+source "$(dirname "$0")/.env"
+set +a
+
+exec npx -y @brave/brave-search-mcp-server