[tool] round_number

[Solanki-Jatin]

Checklist

• File is in tools/ directory
• File has header comments (# tool, # description, # author, # example)
• File has a run() function that returns a string
• Uses stdlib only (no external dependencies)
• Tested locally with python bitbox.py <tool_name> <args>

Closes #332

[abduznik]

Thanks for the contribution — the logic looks good! One small thing before merging: the # example: comment has some garbled/corrupted characters (likely an encoding issue with the arrow ->) instead of plain text. Could you update it to something like:

# example: round_number \3.14159\ \2\ -> \3.14\

Happy to merge as soon as that's fixed!

[Solanki-Jatin]

Fixed! Thanks for catching that.