CapGain safety and work artifacts

Gold402 Verified. Hand-reviewed and on the curated list — curation is the bar. The stamp means a human read this entry and the endpoint answered when we knocked. It is not a delivery test: we have not paid this service and graded what came back, so treat it as "reachable and speaks the protocol," never as "this is worth the money."

EVM token risk and Base swap preflights from $0.01, plus machine-buyable invariant tests ($0.03), repository reviews ($0.05), and protocol research ($0.03), paid in Base USDC via x402. ([x402](https://5-9-107-124.nip.io/.well-known/x402.json))