docs(readme): add ClawHub download history chart

[gavinlinasd]

Hey! 👋

I'm Gavin — I built skill-history.com, a free tool that tracks ClawHub skill download history over time (think star-history.com but for agent skills).

I noticed your skill Pulse Editor has been getting traction — 2386 downloads so far — so I set up a chart page for it:

👉 https://skill-history.com/shellishack/pulse-editor

This PR adds a small download history section to the bottom of your README with a live-updating chart that refreshes daily. Here's what it looks like:

No setup, no tokens, no CI changes — just an SVG embed that auto-updates.

If you'd prefer a compact badge instead of the full chart, you can swap it for this:

![Downloads](https://skill-history.com/badge/shellishack/pulse-editor.svg)

The whole thing is open source: github.com/pineapple-farm/skill-history

It's a brand new project and I'm shaping it based on what skill authors actually want. If you have any feedback, feature requests, or ideas:

• Open an issue
• Submit a PR
• Or just drop a comment here

Totally understand if this isn't your thing — feel free to close. But if it's useful, I'm excited to see it on your README!

Cheers,
Gavin
Pineapple AI

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