GOV.UK Design System — complete local specimen

Implementation: Native GOV.UK Frontend 6.5.1 CSS, Button and ErrorSummary JavaScript, served locally. Alternative Helvetica font; original local-only form validation and review navigation.

1. Extract this archive into its own directory.
2. Run: python3 -m http.server 8080
3. Open: http://localhost:8080/gov-uk.html

The HTML includes the document root, layout/theme overrides and initialization.
Its relative vendor directory includes the actual CSS, JavaScript module chain,
fonts and other packaged assets used by this specimen. Preserve this structure;
ES modules require HTTP rather than opening a file:// URL.

Dependencies included: govuk-6.5.1
Official reference: https://design-system.service.gov.uk/components/error-summary/

This is an original local demonstration, not an affiliated government service.
Actions have no external side effects. Retain supplied dependency licenses.
