Initial commit: @arcus-xyz/arcus-spot-sdk Public, standalone TypeScript SDK for the Arcus / dYdX v5 spot router. Depends only on viem (peer). Includes browser client, viem signing flow, bundled chain deployments, wrapped-token prediction, examples/demo, tests, CI, and an OIDC (npm trusted publishing) release workflow. Co-authored-by: Cursor <cursoragent@cursor.com>