feat: add environment variable support for Claude Code token limits

Introduces .env file configuration to manage CLAUDE_CODE_MAX_TOKENS, allowing flexible control of the context window size for AI analysis sessions. This enables users to tune token limits based on their specific penetration testing needs without modifying code.

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

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

package.json

@@ -12,6 +12,7 @@
     "ajv-formats": "^2.1.1",
     "boxen": "^8.0.1",
     "chalk": "^5.0.0",
+    "dotenv": "^16.4.5",
     "figlet": "^1.9.3",
     "gradient-string": "^3.0.0",
     "js-yaml": "^4.1.0",