Test: Add test file and demonstrate file modification capabilities

[code-xpertai]

Summary

This PR adds a test file to demonstrate file modification capabilities in the sandbox environment.

Changes Made

1. Created new file: /workspace/test_file.txt
2. Added initial content: File includes timestamp, agent information, and description
3. Appended additional content: Demonstrates both write and append operations

File Contents

The test file contains:

• Creation timestamp: 2026-01-31T09:37:07.076Z
• Agent ID: Agent_Hzn7Qd6v4i
• Agent name: Test - sandbox
• Description of the file's purpose
• Additional appended content showing file modification capabilities

Purpose

This PR serves as a demonstration of:

• File creation and writing capabilities
• File appending functionality
• Basic file system operations in the sandbox environment
• Verification that the development tools are working correctly

Testing

The file can be verified by reading /workspace/test_file.txt which shows the complete content including both the initial write and appended sections.

Notes

This is a test PR to validate the development workflow and file modification tools.