feat: complete campaign wizards and retention reporting

docs/CAMPAIGN_HANDBOOK.md

@@ -153,6 +153,15 @@ every action control that the actor lacks. The server authorizes each action,
 but permission-aware action visibility on that detailed surface remains open
 work; do not confuse it with the aggregate reader experience.
 
+The detailed Campaign Report includes the selected campaign's effective
+retention policy, its system/tenant/owner/campaign provenance, and the current
+evidence state. It distinguishes retained, redacted, expired, partially
+minimized, unavailable, and not-applicable source JSON, stored report detail,
+generated EML, and Postbox-copy evidence. When Policy is absent, the report
+shows the platform defaults and explicitly warns that automated retention
+enforcement is unavailable. Retention removes or minimizes detail; aggregate
+counters and audit references may remain so outcomes can still be explained.
+
 ### Deliver and resolve outcomes
 
 Use the [delivery runbook](CAMPAIGN_DELIVERY_RUNBOOK.md) for the detailed