Authentication history

Immutable persisted observations.

Observed	Signal	Selector	Verdict	Fingerprint
2026-08-20T09:44:25+00:00	DMARC	—	VALID	`f5ebc280e6b1…`
2026-08-20T09:44:25+00:00	SPF	—	VALID	`1ff73dcee55c…`