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The entrypoint's _resolvers() unconditionally recomputed RESOLVERS from /etc/resolv.conf and exported it, overwriting any value the user set via the environment — contradicting the documented "no default value" behavior. Now _resolvers() honors a user-provided RESOLVERS and only autodetects from /etc/resolv.conf when it is unset/empty. Adds a "Custom DNS Resolvers" docs section and an integration test covering both the honored and autodetected cases. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>