Integrate governed address contact resolution

docs/IMPLEMENTATION_PLAN.md

@@ -44,13 +44,17 @@ Goal: allow distribution lists to resolve through installed modules.
 
 Tasks:
 
-- [x] integrate with `addresses.lookup` and address-list source capability
+- [x] integrate with versioned, channel-neutral Addresses contact-point
+  resolution; retain lookup/address-list source capabilities as compatibility
+  fallbacks
 - [x] integrate with IDM identity and effective function-assignment resolution
 - [ ] resolve typed IDM groups once `govoplan-idm#7` exposes the provider contract;
   until then the selector and expansion return an explicit unavailable outcome
 - [x] integrate with Organizations unit/function resolution
 - [x] consume governed Datasource/Connector states through pinned Dataflow outputs
 - [x] apply Addresses preference/consent facts and explainable Policy decisions
+- [x] freeze exact postal/email targets, contact-point IDs, revisions,
+  fingerprints, and decision provenance in expansion snapshots
 - [x] preserve module independence when optional providers are absent
 
 ## Milestone 4: UI