Add Google Analytics script to config

[M9nx]

Summary

Add Google Analytics script to config

Changes

I added the Google Analytics tag (G-Q0ELMEF4DB) to the CodexA docs site, and a local build put it on every page. It isn't live yet: you need to commit and push the change, and the docs deploy workflow (deploy-docs.yml) will publish it.

The site is built with VitePress, so I put the tag in the site-wide head setting in docs/.vitepress/config.mts rather than editing any HTML by hand:

['script', { async: '', src: 'https://www.googletagmanager.com/gtag/js?id=G-Q0ELMEF4DB' }],
['script', {}, `window.dataLayer = window.dataLayer || [];
function gtag(){dataLayer.push(arguments);}
gtag('js', new Date());
gtag('config', 'G-Q0ELMEF4DB');`],

After deploying, you can confirm it's working by opening the live site while watching GA's Realtime report.

VitePress changes pages without a full reload. GA4 still counts those page views as long as Page changes based on browser history events is on. It's on by default, under Admin → Data streams → your stream → Enhanced measurement.