Add "Examples" workflow to demonstrate plugin behavior

[rbren]

Summary

A simple plugin that instructs the agent to add valid Python type annotations to files or directories.

Features

• SKILL.md with instructions for adding type annotations (parameters, return types, class attributes, best practices)
• Example before/after Python files demonstrating the transformation
• GitHub Action workflow (update-example.yml) to regenerate examples using OpenHands CLI
• Trajectory output saved from headless runs

Plugin Structure

plugins/python-type-annotations/
├── .claude-plugin/
│   └── plugin.json
├── skills/
│   └── type-annotations/
│       └── SKILL.md
├── examples/
│   └── basic/
│       ├── prompt.md
│       ├── trajectory.json
│       ├── before/
│       │   └── hello.py
│       └── after/
│           └── hello.py
├── workflows/
│   └── update-example.yml
└── README.md

Usage

openhands run \
  --plugin github:OpenHands/extensions/plugins/python-type-annotations \
  --prompt "Add type annotations to all Python files in src/"

Example Transformation

Before:

def greet(name):
    return f"Hello, {name}!"

After:

def greet(name: str) -> str:
    return f"Hello, {name}!"