Upgrade the release tooling to ReleaseKit v0.3.0

docs/roadmap/releasekit.md

@@ -1,6 +1,8 @@
 # ReleaseKit v0.3.0 Upgrade Roadmap
 
-Status: Accepted; implementation pending.
+Status: Complete. ReleaseKit v0.3.0 is selected and the upgraded integration
+is verified. Current workflow requirements belong in the
+[release procedure](../release.md) and [release policy](../policy/release.md).
 
 ## Purpose
 
@@ -12,7 +14,7 @@ wrappers, and product-specific checks locally.
 This is a focused tooling upgrade, not another release-process migration.
 The [release policy](../policy/release.md) and
 [release procedure](../release.md) continue to own PromptKit's release
-requirements and workflow. A separate implementation plan will own staged work.
+requirements and workflow. The upgrade was implemented as one focused unit.
 
 ## Current Baseline And Reviewed Upstream
 
@@ -111,3 +113,12 @@ Completion means v0.3.0 is selected, wiring verification passes without a
 duplicated version pin, and current documentation agrees with the adopted
 tool. No real tag publication is part of implementation verification. Future
 PromptKit release preparation remains a separate task under the runbook.
+
+Implementation verification passed with Go 1.26.8: the module-selected wrapper
+reported `releasekit v0.3.0`, the disposable publication and failure fixtures
+passed, and the ordinary offline Go suite, full vet, and maintained consumer
+examples passed. The fixtures also verified native usage status, same-Go
+bootstrap, and unchanged candidate module metadata. Release profile and wrapper
+contents are unchanged; no real PromptKit tag was published. Upstream notices
+were reviewed; the tooling-only upgrade introduced no incorporated material
+requiring a new attribution entry.