Add: Euclidean Polyrhythm Sequencer

[lakshay122007]

What does this PR do?

An advanced rhythm sequencer that replaces standard linear 16-step grids with concentric glowing rings. It uses the Euclidean algorithm to distribute beats mathematically and evenly (e.g., 5 kicks over 16 steps, 3 snares over 8 steps), creating a mesmerizing, spinning mandala of rhythm that generates hypnotic, complex polyrhythms.

Closes #775

Type of Change

• New instrument
• Enhancement to existing tool
• Bug fix
• Documentation update
• Build system / infrastructure

Screenshot

Checklist

• I have read the Contributing Guide
• My branch follows the naming convention (add/tool-name, feat/description, or fix/description)
• I have tested my changes locally in at least one modern browser

For new tools:

• The tool is a single self-contained .html file in the tools/ folder
• The filename is kebab-case (e.g. json-formatter.html)
• I added an entry to data/tools.json with all required fields
• I added a screenshot as tools/<tool-name>.png next to the HTML file
• No JS frameworks (React, Vue, Angular, etc.) or heavy UI libraries (Bootstrap JS, jQuery, etc.)
• CDN links for lightweight libraries and fonts are fine — no copy-pasting library source code inline
• I ran node scripts/sort-norm.js data/tools.json to sort and normalize the tools registry
• I ran node scripts/build.js and verified the landing page renders correctly

For enhancements / bug fixes:

• I have not introduced any external dependencies
• The tool still works as a standalone single HTML file

[lakshay122007]

Hi @praveenscience Please review it. Thanks!