Added greeting.py with greet and main.

[opencode-agent]

The patch has been applied. Summary of changes:

• Added root-level file: greeting.py
  • Defines function: greet(name: str) -> str
    • Includes a docstring describing the behavior and return value.
    • Returns: "Hello, {name}!"
  • Main guard: if name == "main": prints the result of greet("World")

Usage example:

• Running the script directly will print: Hello, World!

If you’d like, I can run a quick sanity check or adjust the formatting/docstring style to match project conventions.

Closes #693

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