Rebuild production proof page (stack-proof-demo) and update proof links

[GsCommand]

Motivation

• Provide a dedicated, consumer-facing production proof page that explains the end-to-end trust story (MCP bridge → runtime signs → verifier validates → tampering invalidates) separate from the interactive verifier at /verify.html.
• Replace the old stack proof demo with a polished, light-themed production story that uses canonical metadata.proof fields and the verified production signer/key details.

Description

• Rebuilt public/stack-proof-demo.html with the requested light ENS/Stripe visual direction and required sections: hero, three-step proof outcome strip, architecture flow with explicit trust boundaries, canonical receipt example using metadata.proof, valid/invalid verification response cards, local run (terminal) block, and “what this proves / does not claim” copy.
• Updated public/capabilities.html to point its hero "View Proof" CTA and footer proof links to /stack-proof-demo.html (no top-nav changes were made and the page remains distinct from /verify.html).
• ensured visible protocol copy and examples use json.sorted_keys.v1, SHA-256, Ed25519, vC4WbcNoq2znSCiQ, and runtime.commandlayer.eth, and removed/avoided stale or overclaiming language about signing/trust roots.
• Preserved constraints: no files deleted, no API routes or schema files changed, and top nav was not modified to add a "Proof" item.

Testing

• Ran npm install successfully in the repository environment and dependencies are up-to-date.
• Ran npm test and the test suite passed (26 tests, all passing).
• Attempted npm run build and it failed because there is no build script defined in package.json (this is informational and no build artifacts were required for the change).

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Codex Task

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Project	Deployment	Actions	Updated (UTC)
commandlayer-commandlayer-org	Ready	Preview, Comment	May 20, 2026 11:14pm
commandlayer-org	Ready	Preview, Comment	May 20, 2026 11:14pm
commandlayer-org111	Ready	Preview, Comment	May 20, 2026 11:14pm