Added greeting.py with greet() and main

[opencode-agent]

The greeting.py script has been added at the repository root with the required features:

• Function greet(name: str) -> str that returns "Hello, {name}!"
• Docstring included for the function
• name == "main" block that prints the result of greet("World")

File content (greeting.py):

def greet(name: str) -> str:
    """Return a greeting for the given name.

    This function constructs a simple greeting string of the form:
    "Hello, <name>!"
    """
    return f"Hello, {name}!"


if __name__ == "__main__":
    print(greet("World"))

If you’d like any tweaks (additional tests, type hints, or different main behavior), I can adjust quickly.

Closes #693

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