Added calculator.py CLI tool

[opencode-agent]

Implemented the calculator tool.

What I added

• File: calculator.py at repository root
• Features:
  • Command-line interface with subcommands: add, subtract, multiply, divide
  • Arguments: a and b (parsed as floats)
  • Outputs:
    • Prints integer results as integers (e.g., 5 instead of 5.0) when the result is a whole number
    • Prints floats for non-integer results (e.g., 2.5)
  • Basic error handling for division by zero

How it works

• Usage examples:
  • python calculator.py add 2 3 -> prints 5
  • python calculator.py subtract 10 4 -> prints 6
  • python calculator.py multiply 3 4 -> prints 12
  • python calculator.py divide 5 2 -> prints 2.5

Minimal behavior notes

• Division by zero raises a ZeroDivisionError with a clear message.

Patch summary

• Added calculator.py with:
  • add, subtract, multiply, divide functions
  • CLI implemented via argparse with subparsers
  • _format_result to emit clean integer output when appropriate

If you’d like, I can add basic unit tests for these operations or extend the CLI to support integer-only inputs or more advanced features.

Closes #685

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