Adopt native PromptKit resource inspection

docs/consumers/guide.md

@@ -258,12 +258,12 @@ engine's captured configuration. Add that scope to a `ckconfig.Suite` to expose
 it under `config` with validate/show/sources/explain and native diff operations;
 it does not install PromptKit catalog, definition, or requirements commands.
 
-`ckprompt.FromEngine(loadEngine)` supplies eight callbacks: prompt, profile,
-backend, namespace, and collection catalogs; named prompt and profile
+`ckprompt.FromEngine(loadEngine)` supplies nine callbacks: prompt, profile,
+backend, namespace, and collection catalogs; named prompt, profile, and backend
 inspection; and native requirements discovery. Concrete request validation and
 smoke testing are separate capabilities, added explicitly with
 `ckprompt.WithRequestValidation` and `ckprompt.WithSmokeTesting`. The suite has
-ten independently optional callbacks in total. `ckprompt.Command(suite)` creates
+eleven independently optional callbacks in total. `ckprompt.Command(suite)` creates
 only operations whose callbacks are present; discovery, validation, and smoke
 testing can be installed independently. A composed suite can enable both
 additional operations:
@@ -300,7 +300,7 @@ absent, so explicitly supplied empty values stay meaningful. Applications that
 validate and then execute a request are encouraged to share their request
 construction logic between those paths.
 
-The eight catalog and inspection callbacks and the two explicit additions are
+The nine catalog and inspection callbacks and the two explicit additions are
 independently optional. For catalogs without named or requirements inspection,
 narrow the suite before command capture:
 
@@ -308,6 +308,7 @@ narrow the suite before command capture:
 definitions := ckprompt.FromEngine(loadEngine)
 definitions.InspectPrompt = nil
 definitions.InspectProfile = nil
+definitions.InspectBackend = nil
 definitions.InspectRequirements = nil
 definitionCommand := ckprompt.Command(definitions)
 ```