Authentication history

Immutable persisted observations.

Observed	Signal	Selector	Verdict	Fingerprint
2026-08-21T02:53:08+00:00	DMARC	—	VALID	`b5cd90df1d3d…`
2026-08-21T02:53:08+00:00	SPF	—	VALID	`c26307b1c46c…`