"macOS: nslookup works but curl and Python \"Could not resolve host\" — the mDNSResponder zombie"

When nslookup resolves a host but curl, pip, and Python fail with "Could not resolve host" on macOS, the mDNSResponder daemon has gone into a non-responsive zombie state. The two-DNS-path diagnosis, the weakest-first fix, and why long-running agent boxes hit it.

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