CVE-2026-44979: @hapi/wreck leaks sensitive `Proxy-Authorization` header across cross-hostname redirects

When @hapi/wreck follows a 3xx redirect to a different hostname, only the Authorization and Cookie headers are stripped. The standard credential header Proxy-Authorization is forwarded intact to the redirect target, potentially exposing forward-proxy credentials to a host outside the original trust boundary.

Redirect following is opt-in. The redirects option defaults to false (no redirections followed), so applications are only affected if they have explicitly set redirects to a positive integer on the request or via Wreck.defaults({ redirects: ... }).