Authentication history

Immutable persisted observations.

Observed	Signal	Selector	Verdict	Fingerprint
2026-08-16T19:49:28+00:00	DMARC	—	VALID	`2f3887df412a…`
2026-08-16T19:49:28+00:00	SPF	—	VALID	`c515eac99d92…`