Proof Flow Composer: use live x402 paid-action endpoint and verifier

[GsCommand]

Motivation

• Replace the simulated x402 step with the real server-side signed paid-action endpoint so the demo shows a live signed receipt and live verification while keeping Coinbase webhook simulated.

Description

• The composer now POSTs the x402 payload to /api/examples/x402-paid-action with request_id, action, input.text, and payment (including payment_id, protocol: x402, status: accepted, asset: USDC, amount: "0.01", network: base).
• The page generates a trace_id, simulates the Coinbase webhook event, captures the returned signed x402 receipt, displays the receipt JSON, and then POSTs the receipt to /api/verify to display verification JSON and summary fields (hash_matches, signature_valid, signer, key_id, trace_id, receipt_id).
• UI copy and badges were updated to label steps as requested: Coinbase = simulated adapter event, x402 = live signed endpoint, Action = executed by signed x402 endpoint, Verify = live verifier, and the trust-boundary copy was adjusted.
• Explicit failure handling and user-visible error outputs were added for network errors, x402_endpoint_unavailable, signing_unavailable, and verifier invalid/error responses, and existing copy buttons were preserved.
• Files modified: public/proof-flow-composer.html and public/integrations.html.

Testing

• Ran npm test which completed successfully (all tests passed).
• Searched for forbidden string with grep -RIn "erc8211.merkle.v1" public README.md tests api scripts docs examples and found no matches.
• Manual QA instructions included in commit notes: open /proof-flow-composer.html, click Run, confirm trace_id, receipt JSON, verification JSON and summary fields, and exercise copy buttons and negative error paths.

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Codex Task

[vercel]

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Project	Deployment	Actions	Updated (UTC)
commandlayer-commandlayer-org	Ready	Preview, Comment	May 23, 2026 9:32pm
commandlayer-org	Ready	Preview, Comment	May 23, 2026 9:32pm
commandlayer-org111	Ready	Preview, Comment	May 23, 2026 9:32pm