Add reusable PromptKit request flags

docs/consumers/guide.md

@@ -326,6 +326,12 @@ and state. `FromEngine` uses PromptKit's public listing and inspection methods,
 including `Engine.InspectRequirements`; validation must be opted into separately
 and uses `Engine.ValidateRequest`.
 
+Application-owned commands can use `ckprompt.NewExecutionFlags`,
+`ckprompt.NewResourceFlags`, and `ckprompt.NewPromptInputFlags` to bind the
+same canonical request flags into their own input types. Each collection exposes
+individual handles and an `All` method, so a command can choose its applicable
+subset. The application decides how to apply the resulting values to its request.
+
 Catalog, named definition inspection, and requirements discovery do not render
 messages or load request artifacts. Concrete request validation follows native
 PromptKit preparation, which can resolve prompt/profile resources, load