Add Ulam Prime Spiral demo under public/cool with standalone HTML

[tomadowley]

This PR introduces a new standalone, zero-dependency Ulam Prime Spiral demo under public/cool/ulam-spiral.html. It can be served alongside the app without touching the existing TS/React build.

What’s added:

• COOL.md describing the feature and usage
• public/cool/ulam-spiral.html with a full-screen canvas visualization, a small UI, and no external libraries

Key features:

• Adjustable points count, step size, and color customization for prime and composite points
• Animate or instant render modes
• Self-contained: no build changes, works with standard React/TS setups or any static server
• FPS display during animation and graceful resizing

How to use:

• Start your dev server and open http://localhost:3000/cool/ulam-spiral.html (or serve the public folder directly)
• Use the UI to configure points, step size, mode, and colors, then click Draw (or Reset to clear)

Implementation notes:

• Primality testing uses a lightweight trial-division approach sufficient for the intended point counts
• The spiral is generated algorithmically and drawn on a canvas; rendering does not touch existing code or build configuration
• The demo is standalone HTML/JS/CSS and stores no state in the TS/React app

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This pull request was co-created with Cosine Genie

Original Task: sorbox/qkf9eqw7hydq
Author: Tom Dowley

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Project	Deployment	Preview	Comments	Updated (UTC)
sorbox	Ready	Preview	Comment	Dec 4, 2025 3:38pm