Authentication history

Immutable persisted observations.

Observed	Signal	Selector	Verdict	Fingerprint
2026-08-21T04:27:39+00:00	DMARC	—	VALID	`37b9bf5c5e34…`
2026-08-21T04:27:39+00:00	SPF	—	INVALID	`6af6dd49e898…`