Formally define step config, pass to stream.

recipes/example/nested.expected/basic.json

Index: recipes/example/nested.expected/basic.json
diff --git a/recipes/example/nested.expected/basic.json b/recipes/example/nested.expected/basic.json
index b1cb0f35a42442515d3bb597b8888ee44b585a4f..b5f4fe4d1b76663dd501076ca765435619742077 100644
--- a/recipes/example/nested.expected/basic.json
+++ b/recipes/example/nested.expected/basic.json
@@ -1,10 +1,8 @@
 [
   {
-    "cmd": [],
     "name": "complicated thing"
   },
   {
-    "cmd": [],
     "name": "complicated thing.first part",
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@"
@@ -41,11 +39,9 @@
     ]
   },
   {
-    "cmd": [],
     "name": "inherit status"
   },
   {
-    "cmd": [],
     "name": "inherit status.inner step",
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@",
@@ -53,21 +49,18 @@
     ]
   },
   {
-    "cmd": [],
     "name": "versatile status",
     "~followup_annotations": [
       "@@@STEP_FAILURE@@@"
     ]
   },
   {
-    "cmd": [],
     "name": "versatile status.inner step",
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@"
     ]
   },
   {
-    "cmd": [],
     "name": "versatile status.inner step.even deeper",
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@2@@@"