Add GitHub Hop extension

[ajanlab]

Description

Add GitHub Hop, a PopClip extension that resolves selected text to GitHub repo pages.

Features

• owner/repo format (e.g. facebook/react) → instant jump, zero latency
• Project name (e.g. lodash) → resolves via GitHub Search API
• @username → auto-strip and search
• Transparent fallback to GitHub search page on API failure

Requirements

• PopClip 4631+
• macOS 10.15+
• Only uses macOS built-in tools (bash, python3, curl)

Privacy

• No data uploaded except the text you explicitly selected, sent to the public GitHub API
• No analytics, no telemetry, no third-party endpoints
• No cache files, no logs, no state
• No API keys, no login, no network authorization required

Notes

• Icon: iconify:simple-icons:github
• Shell script extension with Python inline for JSON parsing
• Passes 'set -euo pipefail' for robust error handling
• Includes a test suite (test.sh, 5/5 passing)