Authentication history

Immutable persisted observations.

Observed	Signal	Selector	Verdict	Fingerprint
2026-08-20T05:02:58+00:00	DMARC	—	VALID	`11f8e10b9c95…`
2026-08-20T05:02:58+00:00	SPF	—	VALID	`126b3d778903…`