Authentication history

Immutable persisted observations.

Observed	Signal	Selector	Verdict	Fingerprint
2026-08-20T22:45:41+00:00	DMARC	—	VALID	`ae69c0dd2716…`
2026-08-20T22:45:41+00:00	SPF	—	VALID	`c1167eaf2f81…`