Authentication history

Immutable persisted observations.

Observed	Signal	Selector	Verdict	Fingerprint
2026-08-17T01:50:18+00:00	DMARC	—	VALID	`a4aadd608e13…`
2026-08-17T01:50:18+00:00	SPF	—	INVALID	`13a70657e8d2…`