4 documentation complete architecturemd

[tbatchelder]

What does this change? Documentation and branding

Why? Because it wasn't correct.

Checklist

• npm test passes
• npm run format has been run
• If this touches src/ui/panel.js or fonts, I've manually verified it in a real browser (jsdom tests cover behavior, not visual layout — see docs/ARCHITECTURE.md)
• If this changes scope (what PrefKeeper does/doesn't do), I've checked it against docs/SCOPE.md

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