Authentication history

Immutable persisted observations.

Observed	Signal	Selector	Verdict	Fingerprint
2026-08-19T04:06:28+00:00	DMARC	—	VALID	`0ebb7b00868d…`
2026-08-19T04:06:28+00:00	SPF	—	VALID	`665617e94ce3…`