Authentication history

Immutable persisted observations.

Observed	Signal	Selector	Verdict	Fingerprint
2026-08-17T01:54:26+00:00	DMARC	—	VALID	`a99d8b734a37…`
2026-08-17T01:54:26+00:00	SPF	—	VALID	`ec8789b67236…`