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Live S1 validation caught it: a stock multi-hostkey sshd presented ECDSA while we pin ed25519 → FixedHostKey refused a legitimate server. Regression test with an in-process dual-hostkey server (fails without the fix — red-proofed). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PSK5g6qYLknKj8u3QAFEr6