Authentication history

Immutable persisted observations.

Observed	Signal	Selector	Verdict	Fingerprint
2026-08-22T00:01:12+00:00	SPF	—	UNKNOWN	`5748df1e4bc3…`
2026-08-16T19:27:21+00:00	DMARC	—	VALID	`c7e394ba3365…`
2026-08-16T19:27:21+00:00	SPF	—	VALID	`b2a48bc2ca52…`