Authentication history

Immutable persisted observations.

Observed	Signal	Selector	Verdict	Fingerprint
2026-08-20T11:51:32+00:00	DMARC	—	UNKNOWN	`b49656369da5…`
2026-08-20T11:51:32+00:00	SPF	—	VALID	`24adfe3d1ab0…`