fix(analytics): preserve gtag command arguments

[xiongxz]

Summary

• queue GA4 commands as Arguments objects, matching the Google tag contract
• apply the fix to all 14 templates
• harden the analytics validator against array-wrapped commands that Google silently ignores

Production evidence

The deployed smoke site loaded gtag.js but emitted no collect request. A controlled browser comparison showed the existing array queue emitted zero requests, while the corrected queue emitted page_view and user_engagement to G-V115N4DD30.

Validation

• node scripts/check-analytics.mjs
• node scripts/validate-registry.mjs
• npm --prefix scripts test
• npm --prefix website-change-monitor run build
• headless Chrome netlog: corrected built template emitted GA4 page_view with application_id=app_template_e2e