feat(site): add local/dev stack proof demo page

[GsCommand]

Motivation

• Provide a developer-facing, local/dev proof demo that documents the canonical CommandLayer stack flow and expected verification outcomes without claiming production availability.
• Make the canonical proof envelope and required metadata explicit so integrators can implement canonicalization, hashing, and signature verification correctly.

Description

• Added public/stack-proof-demo.html containing the canonical flow, a sample canonical proof envelope, and expected VerifyAgent outcomes (VERIFIED / INVALID).
• The demo includes metadata.proof.canonicalization = json.sorted_keys.v1, metadata.proof.hash.alg = SHA-256, and metadata.proof.signature.alg = Ed25519 in the example envelope.
• Added a "Run it locally" block that references runtime: npm test, verifyagent: npm run e2e:runtime, and mcp-server: npm test, plus an architecture text diagram and trust-model warnings.
• Added a CTA link from public/docs.html to the new public/stack-proof-demo.html page.

Testing

• Ran npm install, which completed successfully.
• Ran npm run build, which failed due to a missing build script in package.json.
• Ran npm test (node --test tests/*.test.js), and the test suite passed (20 tests passed, 0 failed).

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Codex Task

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Project	Deployment	Actions	Updated (UTC)
commandlayer-commandlayer-org	Ready	Preview, Comment	May 20, 2026 1:35am
commandlayer-org	Ready	Preview, Comment	May 20, 2026 1:35am
commandlayer-org111	Ready	Preview, Comment	May 20, 2026 1:35am