20b9522: Request httpMetadata and customMetadata when listing through the R2 Workers binding, so list() reports the stored content type and metadata instead of application/octet-stream and undefined. Completes #116 for the binding path (#128 covered the S3/HTTP paths), and with exact stored values rather than extension inference, since the binding API offers them.
e6e6444: Add an optional endpoint to the r2 adapter (R2HttpOptions and hybrid-mode R2BindingOptions), falling back to the default https://<accountId>.r2.cloudflarestorage.com. Jurisdiction buckets (eu, fedramp) live on their own hostnames and were previously unreachable through the r2 adapter; the override also lets tests point the adapter at S3-compatible stand-ins like MinIO or LocalStack. When endpoint is set, accountId becomes optional — it only ever feeds the default hostname.