add block inspect, status: up to first jump

app/main/models/block_model.rb

@@ -0,0 +1,13 @@
+
+# represent a block and hold the actual instance (as transient)
+
+class BlockModel < Volt::Model
+  field :name
+  attr_accessor :block
+
+  def initialize(b)
+    super()
+    @block = b
+    self.name = b.nil? ? 'undefined' : b.name
+  end
+end