Authentication history

Immutable persisted observations.

Observed	Signal	Selector	Verdict	Fingerprint
2026-08-18T00:49:03+00:00	DMARC	—	VALID	`00b326aaa695…`
2026-08-18T00:49:03+00:00	SPF	—	VALID	`e06a3b63d5fa…`