Restyle /proof.html and /receipts.html to match CommandLayer site layout

[GsCommand]

Motivation

• The existing /proof.html and /receipts.html rendered as plain pages and lacked the global site chrome, hero, card layout, styled code blocks, and footer used across commandlayer.org.
• The pages needed to follow the same navigation, Docs dropdown, responsive patterns, and footer groups used by other canonical pages to preserve visual consistency.
• The change must preserve all proof/receipt semantics and avoid touching API, signing, verifier, runtime, or claim logic.

Description

• Rebuilt public/receipts.html to use the canonical site shell including the global nav (with full Docs dropdown), branded hero and CTA buttons, card-based sections, dark code/status blocks, responsive grids, and the 3-column footer groups (Product / Developers / Proof).
• Restyled public/proof.html to match site UI patterns by improving hero CTA styling and making the verification status block overflow- and whitespace-safe (white-space: pre) while preserving original content and wording.
• Added/used shared site CSS and site classes (/css/site.css) and introduced consistent .status-block / .code-block / .card / .section-grid patterns to keep behavior consistent with protocol.html, capabilities.html, and other pages.
• Only visual/markup changes were made to public/proof.html and public/receipts.html; no API, verification, signing, or receipt semantic logic was changed.

Testing

• Ran npm test with the repository test suite and all tests passed (65 tests, 0 failures).
• Ran npm run check:links and local link resolution completed successfully across HTML files.
• Searched for forbidden string and found no matches using grep -RIn "erc8211.merkle.v1" against the repo (no results).

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Codex Task

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Project	Deployment	Actions	Updated (UTC)
commandlayer-commandlayer-org	Ready	Preview, Comment	May 25, 2026 11:34pm
commandlayer-org	Ready	Preview, Comment	May 25, 2026 11:34pm
commandlayer-org111	Ready	Preview, Comment	May 25, 2026 11:34pm