Authentication history

Immutable persisted observations.

Observed	Signal	Selector	Verdict	Fingerprint
2026-08-20T04:01:17+00:00	DMARC	—	VALID	`1e19bdb67334…`
2026-08-20T04:01:17+00:00	SPF	—	VALID	`6be96c0ba367…`