Verify PromptKit smoke outcomes and delivery

docs/roadmap/implementation.md

@@ -1,6 +1,6 @@
 # Dependency upgrades, discovery, and smoke testing implementation plan
 
-Status: Stages 1–13 complete; Stage 14 is next.
+Status: Stages 1–14 complete; Stage 15 is next.
 
 ## Authority and baseline
 
@@ -694,6 +694,14 @@ provider smoke-test correctness belongs upstream.
 **Complete when:** realistic smoke failures preserve their reports, native error
 identity, and delivery outcomes without a parallel diagnostic test suite.
 
+**Completed:** 2026-10-17. Added outcome and delivery coverage for false/unknown
+observations, error-only and report-plus-error results, cancellation before and
+after acquisition, and retained aggregate results across cancellation. Tests
+also cover error and short report writes, encoding failure, diagnostic writer
+failure, operation plus delivery errors, ordered diagnostics, and joined
+`errors.Is`/`errors.As` identity. The full ckprompt suite passed with
+`GOTOOLCHAIN=local go test -count=1 ./...`.
+
 ## Stage 15: Demonstrate the new interfaces in the maintained consumer
 
 **Primary files:** `integrations/ckprompt/examples/composed`, its README,