Authentication history

Immutable persisted observations.

Observed	Signal	Selector	Verdict	Fingerprint
2026-08-18T04:21:14+00:00	DMARC	—	VALID	`fb846e8fe47c…`
2026-08-18T04:21:14+00:00	SPF	—	VALID	`ca2f1a1c1ac6…`