feat(ECR-009): Ops-D order filters, plan display prices, refund status

LOOP-RUN-002 sample: admin order multi-filter, membership display
price catalog, read-only refund_status. No real payment or RBAC.

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/HANDOFF/ECR-009-architect-to-engineer.md

@@ -0,0 +1,9 @@
+# HANDOFF — ECR-009 Architect → Engineer
+
+**From:** Architect  
+**To:** Engineer  
+**ECR:** ECR-009  
+**BD:** BD-2026-009 Approved  
+**Spec:** ops-commerce Active  
+
+Implement plan.yaml scope only. Do not wait for re-confirmation of plan.

docs/HANDOFF/ECR-009-engineer-to-reviewer.md

@@ -0,0 +1,6 @@
+# HANDOFF — ECR-009 Engineer → Reviewer
+
+**From:** Engineer  
+**To:** Reviewer  
+**Result:** Implementation complete for Ops-D scope  
+**Tests:** TestOpsCommercePhaseD PASS · admin-h5 build PASS