Authentication history

Immutable persisted observations.

Observed	Signal	Selector	Verdict	Fingerprint
2026-08-23T12:01:12+00:00	SPF	—	UNKNOWN	`5748df1e4bc3…`
2026-08-16T20:51:26+00:00	DMARC	—	ABSENT	`b7d77c92cfdd…`
2026-08-16T20:51:26+00:00	SPF	—	ABSENT	`b081350f91db…`