Add reusable PromptKit request flags

docs/roadmap/implementation.md

@@ -1,6 +1,6 @@
 # Shared reporting and PromptKit v0.20.0 implementation plan
 
-Status: implementation in progress; Stages 1–9 complete.
+Status: implementation in progress; Stages 1–10 complete.
 
 ## Scope, authority, and execution
 
@@ -350,6 +350,11 @@ for the converted commands.
 
 ## Stage 10: Reusable execution and resource flag collections
 
+**Complete.** Reusable request flag collections feed requirements discovery,
+validation, and smoke requests; the next stage supplies ordered text/file
+precedence and prepared-request preview. The root, ckconfig, and ckprompt
+workspace suites passed with Go 1.27.0, including collection and builder tests.
+
 Implement CLI-specific collections in ckprompt using ordinary public core flags.
 Use typed flag-set structs exposing named original `Flag[I]` handles and an
 `All() []Flag[I]` convenience method; callers select subsets with ordinary slices.