Authentication history

Immutable persisted observations.

Observed	Signal	Selector	Verdict	Fingerprint
2026-08-18T00:49:07+00:00	DMARC	—	VALID	`eff44eede9f9…`
2026-08-18T00:49:07+00:00	SPF	—	VALID	`1ff73dcee55c…`