Authentication history

Immutable persisted observations.

Observed	Signal	Selector	Verdict	Fingerprint
2026-09-04T12:01:28+00:00	SPF	—	UNKNOWN	`5748df1e4bc3…`
2026-08-18T01:52:05+00:00	DMARC	—	ABSENT	`b7d77c92cfdd…`
2026-08-18T01:52:05+00:00	SPF	—	ABSENT	`b081350f91db…`