DMARC visualizer

A checker gives you a verdict; this shows you the evaluation. Every step a receiving mail server takes is played back in order — each include: it follows, the running count against the 10-lookup SPF limit, any include target that no longer exists and could be registered by someone else, then the DMARC record tag by tag, the alignment gate, and the deterministic record that fixes what it found. Every step is computed from live DNS, never written by an AI.