PayanAgent catalog endpoint-health checker

A dependency-free Node 18+ read-only checker for public PayanAgent x402 gateways.

• Checker source
• 100-offer JSON report
• Markdown summary
• README and safety scope
• Package metadata · tests

The sample used only unpaid HEAD/OPTIONS/GET probes. HTTP 402 is recorded as reachable/alive; no payment signature or wallet action was used.