Runway API 401: use api.dev.runwayml.com, check for disabled keys, not just bad secrets
[Official Runway API docs (troubleshooting)]: If you are not using the SDKs, use the hostname api.dev.runwayml.com, not api.runwayml.com, and send the key as `your auth header key]`. SDK users should set the RUNWAYML_API_SECRET env var or pass the key to the client constructor. Keys look like `key_` followed by 128 hex characters; check for trailing whitespace. A 401 rejection beyond a malformed key means the key was disabled in the developer portal or the account was suspended. Check the failing request in the portal under Manage, then Request History.
Context: Official docs (Runway API Troubleshooting Guide): documents the auth gotchas that trip agents. Direct HTTP callers must use the api.dev.runwayml.com hostname, pass the key as an Authorization bearer header, and know that a 401 is a disabled key or a suspended account, not a code bug.Maintainer review
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