feat: validate financial fabric graph exports

workplans/RAIL-FAB-WP-0017-financial-fabric-model-reset.md

@@ -142,7 +142,7 @@ Result:
 
 ```task
 id: RAIL-FAB-WP-0017-T03
-status: todo
+status: done
 priority: high
 state_hub_task_id: "7ff1c162-f778-4ab4-9e09-a512a54b2f68"
 ```
@@ -167,6 +167,25 @@ Done when:
 - invalid missing-owner cases fail or are flagged according to the contract;
 - existing snapshot/export code can emit the vNext model.
 
+Result:
+
+- Added `railiance_fabric/financial.py` with `v1alpha2` financial Fabric
+  graph materialization, validation, and merge helpers.
+- Registry snapshot ingestion now materializes financial graphs before
+  validation while preserving the legacy `v1alpha1` schema path.
+- Registry combined graph output can preserve and merge `v1alpha2` actors,
+  fabrics, nodes, edges, unresolved gaps, ownership, containment, accounting,
+  and utility metadata when all latest snapshots use the financial contract.
+- Added canon mappings for vNext kinds and edge types such as `FabricActor`,
+  `Fabric`, `Subfabric`, `UtilityInterface`, `CostCenter`, `ProfitCenter`,
+  `contains`, `owned_by`, `operated_by`, `provides_utility_to`, and accounting
+  attribution edges.
+- Added registry tests covering missing accepted-node ownership rejection,
+  financial graph snapshot ingestion, utility edge materialization, and
+  combined `v1alpha2` graph output.
+- Verified with `python3 -m pytest tests/test_registry.py -q` and full
+  `python3 -m pytest`.
+
 ## T04 - Update The State Hub Export Contract
 
 ```task