Add scvd.store to Websites

[cv-scvd]

What

Adds scvd.store to the Websites section: a live x402 general store for AI agents that also ships a parallel WebMCP surface.

Why it fits

The site registers four read-only tools via navigator.modelContext:

• read_store_guide — the store's own machine-readable guide/menu
• preflight_endpoint — free pre-payment simulation of any x402 endpoint's accepts selection logic (what a configured x402 client would sign, before any signature exists)
• check_conformance — free x402 v2 conformance checking against any issuer's signed offers/receipts, including competitors'
• verify_artifact — independent verification of a signed certificate against the store's published key

WebMCP tools here are deliberately read-only by design (nothing that moves money registers on navigator.modelContext); the store's own x402 payment flow is the separate, funded path. This is a live production site, not a demo — the tools back the same free conformance/preflight desk the store already runs at /api/conformance and /api/before-you-pay/v1.

Checklist

• Live, working site (not a demo/prototype)
• Actual WebMCP tools registered (not a stub)
• One entry, one PR
• Format matches existing README convention

[seancrecord]

A current-scope update for this existing SCVD submission: a fresh isolated Chrome 152.0.7977.83 session on September 17 loaded https://scvd.store with default flags and returned 14 registered tools through modelContext.getTools().

The PR's original four-tools/read-only description is now stale. The current surface includes free evidence tools (including preflight_endpoint, check_conformance, verify_artifact and check_a2a_card), a free quote tool, and complete_store_purchase. That last tool requires an explicitly buyer-authorized, already-signed x402 payment and may transfer USDC. It does not accept wallet secrets. The registration check did not invoke any tool or attempt payment.

Suggested current entry:

• SCVD General Store - Evidence tools for agentic commerce exposed to browser agents through WebMCP, including payment-challenge inspection and signed-artifact verification. Source.

Current implementation: https://scvd.store/webmcp.js · Developer docs: https://scvd.store/developers. Browser support applies. Keeping this follow-up on the existing PR rather than opening a duplicate.