feat: version state hub fabric export contract

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

@@ -190,7 +190,7 @@ Result:
 
 ```task
 id: RAIL-FAB-WP-0017-T04
-status: todo
+status: done
 priority: high
 state_hub_task_id: "d10f120d-746d-468d-b208-d946b54c2707"
 ```
@@ -215,6 +215,24 @@ Done when:
 - compatibility tests cover both old baseline import behavior and the new
   vNext export behavior, or intentionally document a controlled breaking reset.
 
+Result:
+
+- Updated `schemas/state-hub-export.schema.yaml` to accept both the legacy
+  `railiance.fabric/v1alpha1` declaration-centered export and the
+  `railiance.fabric/v1alpha2` / `financial-fabric-v1` export.
+- Added schema fields for netkingdom, actors, fabrics, node containment,
+  node ownership, accounting attribution, evidence, utility edge
+  provider/consumer context, boundary crossing flags, and unresolved gaps.
+- Added `examples/exports/financial-fabric-v1.json` as a materialized sample
+  payload.
+- Updated `docs/state-hub-integration.md` to describe the v1alpha1/v1alpha2
+  contract split, State Hub import expectations, and the current limitation
+  that `STATE-WP-0050` only materializes v1alpha1 until `STATE-WP-0051`.
+- Added schema compatibility coverage for both old and financial graph export
+  shapes.
+- Verified with `python3 -m pytest tests/test_registry.py -q` and full
+  `python3 -m pytest`.
+
 ## T05 - Seed The Current Railiance Netkingdom Baseline
 
 ```task