Add KillPy to environment management section

[Tlaloc-Es]

Project

KillPy
https://github.com/Tlaloc-Es/killpy

Checklist

• One project per PR
• PR title format: Add killpy
• Entry format: - [project-name](url) - Description ending with period.
• Description is concise and short

Entry

• [KillPy](https://github.com/Tlaloc-Es/killpy) - Analyze, detect, rank, and safely clean unused Python environments and pipx packages.

Why This Project Is Awesome

• Hidden Gem - Exceptional quality, solves niche problems elegantly

Explain:

KillPy goes beyond simple cleanup tools by intelligently analyzing Python environments, ranking them based on usage, size, and activity, and providing safe, actionable suggestions. It helps developers reclaim disk space while avoiding accidental deletion of active environments.

How It Differs

Unlike basic cleanup tools or manual deletion, KillPy:

• Detects multiple types of Python environments automatically
• Ranks environments using usage patterns and size
• Integrates signals like project activity (e.g., Git)
• Provides safe suggestions instead of blind deletion

This makes it closer to an intelligent environment manager than a simple cleanup script.

[JinyangWang27]

@vinta This PR contains 14 commits, can you squash and merge?