YusufB5/ASCILINE-Mascots ? reverse-engineered prompt

Build me a small vanilla JavaScript library and demo that lets little ASCII or pixel art mascots live on top of a web page.

I want the mascots to walk around headings, paragraphs, and buttons like they are real objects, fall with gravity, bounce off things, and be draggable with a nice throw when I let go. The page content should stay usable underneath, so don’t wrap or damage the text, just detect it cleanly and keep SEO friendly behavior.

Please include a simple way to load the engine with one script, spawn a mascot by name, register custom mascots, and point to an assets folder for animation frames. A few built in examples would be great, like a walking cat and a flying cat, plus a demo page that shows them moving around the page.

If you need to check current browser docs or best practices while building it, go ahead and look them up online.