Audit node registration coverage

docs/prompt-pool-routing-map.md

@@ -920,12 +920,15 @@ The script does not import ComfyUI. It parses the repo and prints:
 - node documentation validation so every registered ComfyUI display name appears
   in this route map or the README before the node can silently drift out of
   user-facing docs.
+- node registration validation so every concrete `SxCP...` node class in a
+  node module is present in that module's class mapping, has a matching display
+  mapping, and uses the same mapping key as the class name.
 
 Use its output to spot doc drift after adding a new node or pool. If a new node
 or pool appears there but not in this map, update the relevant route table. The
 script exits nonzero when JSON pool references, item template axes, category
 identities, critical route docs, critical route smoke registrations, or
-registered node display names do not resolve.
+registered node classes/display names do not resolve.
 
 ## Behavioral Smoke Helper