Check effective release target membership

docs/roadmap/remediation.md

@@ -4,7 +4,7 @@
 `3c405f0524ec6c098d00d4e371abbace7648d446`.
 **Scope:** ReleaseKit adoption commits after `721365e`, including CLI version
 reporting, local release wiring, CI delivery, tests, and documentation.
-**Status:** R1 addressed; R2–R3 pending. The findings below describe the reviewed
+**Status:** R1–R2 addressed; R3 pending. The findings below describe the reviewed
 baseline; completed work is recorded under Resolution Record.
 
 ## Architecture Assessment
@@ -136,3 +136,8 @@ matrix.
   trailing arguments. Non-help usage errors retain status `2`. Regression tests
   reproduced both defects before the fix; `go test ./internal/cli ./cmd/audita`
   passed afterward. The CLI contract reflects ordinary help behavior.
+- **R2:** Delivery targets are compared as sets using the standard library.
+  Regression cases reject either missing Linux target concealed by duplicates
+  and an unintended target, while accepting equivalent reordered/repeated lists.
+  The cases reproduced the faulty membership behavior before the fix;
+  `go test ./scripts` passed afterward.