wo-po-lookup, po-sync, and workorder-sync read WorkOrders,
WorkOrderComments, purchase-orders and PaymentsDashboard, which are now
SSE-encrypted with alias/seahaven-dynamodb. Tables are imported by name
so grantReadData adds no KMS perms; grant kms:Decrypt explicitly via the
CMK imported from SSM /seahaven/dynamodb/cmk-arn. Replaces the interim
CLI inline policy (Sid Infra95DynamoDbCmkDecrypt) with IaC.
INFRA-95