Authentication history

Immutable persisted observations.

Observed	Signal	Selector	Verdict	Fingerprint
2026-08-16T20:10:12+00:00	DMARC	—	VALID	`bdb7ec76c92a…`
2026-08-16T20:10:12+00:00	SPF	—	VALID	`c69115e657da…`