Align stack-proof-demo page chrome with shared site styles

[GsCommand]

Motivation

• Make stack-proof-demo.html visually consistent with the rest of the site by normalizing header/nav/footer chrome and the hero badge while preserving the proof demo content and layout.

Description

• Add the shared stylesheet import </css/site.css> (via <link rel="stylesheet" href="/css/site.css" />) so nav/link/button defaults match other pages.
• Replace the old eyebrow label with the shared pill badge style using hero-badge and badge-dot while keeping the label text as "Production Proof" and centered above the H1.
• Hide the duplicate brand text by matching shared brand rules (.brand span{display:none}) and adjust the brand image sizing to match other pages.
• Update local CSS snippets in the file to adopt the shared header/nav active-state and to convert the footer to the three-column footer-grid layout; all proof/code boxes and story content remain unchanged.

Testing

• Opened and inspected public/stack-proof-demo.html and compared its header/badge/footer against public/capabilities.html, public/protocol.html, and public/verify.html to confirm visual parity.
• Ran a file-existence check for the main pages under public/ to ensure footer targets exist (protocol.html, capabilities.html, verify.html, etc.).
• Reviewed the diff for public/stack-proof-demo.html to confirm only that file was modified and the changes are limited to stylesheet import, badge/header CSS/markup, and footer layout.
• All automated checks completed successfully.

---

Codex Task

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
commandlayer-commandlayer-org	Ready	Preview, Comment	May 21, 2026 7:45pm
commandlayer-org	Ready	Preview, Comment	May 21, 2026 7:45pm
commandlayer-org111	Ready	Preview, Comment	May 21, 2026 7:45pm