Response field foundation_dns removed

What changed

Reads of this field return undefined, and the failure surfaces wherever that value is used rather than at the call.

Affects dns-settings_dns-settings-response reachable from 4 operations.

Who is affected

Code that reads Cloudflare's dns-settings_dns-settings-response objects, used by 4 Cloudflare operations.

Before and after

Code that breaks

// response.foundation_dns is now undefined
const foundation_dns = response.foundation_dns;

Based on Cloudflare’s published API specification. How severity is decided.