Authentication history

Immutable persisted observations.

Observed	Signal	Selector	Verdict	Fingerprint
2026-08-17T01:28:56+00:00	DMARC	—	VALID	`8c4c7c306239…`
2026-08-17T01:28:56+00:00	SPF	—	VALID	`c18f9ec0c4ab…`