diff --git a/docs/roadmap/implementation.md b/docs/roadmap/implementation.md
index 9bc6466..d962763 100644
--- a/docs/roadmap/implementation.md
+++ b/docs/roadmap/implementation.md
@@ -1,6 +1,6 @@
 # Audit remediation implementation plan
 
-Status: in progress; Stages 1–10 complete.
+Status: in progress; Stages 1–11 complete.
 
 Baseline: `d492c7747175c01a53261206c2b4356e53453621`. Before this sprint,
 intervening changes recorded decisions and retired the completed older
@@ -380,6 +380,12 @@ Complete when exported guidance accurately states the already selected rules.
 
 ## Stage 11 — Export the shared ConfigKit diagnostic adapter
 
+**Complete.** `ckconfig.AdaptDiagnostics` captures the existing diagnostic
+presentation for ordinary and comparison callers. Focused ConfigKit adapter and
+comparison tests passed offline in the aligned Go 1.27.0 workspace with
+`-mod=readonly`, including public helper snapshot and writer-failure coverage.
+F21 remains open until ckprompt adopts it in Stage 12.
+
 Findings: F21, ckconfig portion. Source: ckconfig `configkit_adapter.go`.
 
 1. Expose the existing configKitDiagnosticsWithHeading responsibility as:
diff --git a/integrations/ckconfig/configkit_adapter.go b/integrations/ckconfig/configkit_adapter.go
index f229aa8..fd5b470 100644
--- a/integrations/ckconfig/configkit_adapter.go
+++ b/integrations/ckconfig/configkit_adapter.go
@@ -127,14 +127,17 @@ func loadComparisonSide[I, S, T any](
 }
 
 func configKitDiagnostics(scope string, sources []configkit.SourceInfo, records []configkit.Diagnostic) ([]commandkit.Diagnostic, commandkit.Explanation) {
-	return configKitDiagnosticsWithHeading("Configuration scope "+strconv.Quote(scope)+":\n", sources, records)
+	return AdaptDiagnostics("Configuration scope "+strconv.Quote(scope)+":\n", sources, records)
 }
 
 func configKitComparisonDiagnostics(scope, side string, sources []configkit.SourceInfo, records []configkit.Diagnostic) ([]commandkit.Diagnostic, commandkit.Explanation) {
-	return configKitDiagnosticsWithHeading("Configuration scope "+strconv.Quote(scope)+" "+side+":\n", sources, records)
+	return AdaptDiagnostics("Configuration scope "+strconv.Quote(scope)+" "+side+":\n", sources, records)
 }
 
-func configKitDiagnosticsWithHeading(heading string, sources []configkit.SourceInfo, records []configkit.Diagnostic) ([]commandkit.Diagnostic, commandkit.Explanation) {
+// AdaptDiagnostics captures ConfigKit diagnostics as CLI presentation evidence.
+// It does not print, acquire configuration, determine outcomes, or schedule messages.
+// The heading is used as supplied when the captured evidence is rendered.
+func AdaptDiagnostics(heading string, sources []configkit.SourceInfo, records []configkit.Diagnostic) ([]commandkit.Diagnostic, commandkit.Explanation) {
 	if len(records) == 0 {
 		return nil, commandkit.Explanation{}
 	}
diff --git a/integrations/ckconfig/contracts_adapter_test.go b/integrations/ckconfig/contracts_adapter_test.go
index ff0f735..0c0e322 100644
--- a/integrations/ckconfig/contracts_adapter_test.go
+++ b/integrations/ckconfig/contracts_adapter_test.go
@@ -235,20 +235,23 @@ func TestFromConfigKitRetainsResultEvidenceWithApplicationFailure(t *testing.T)
 }
 
 func TestConfigKitDiagnosticsMapSeverityAndPropagateWriterFailures(t *testing.T) {
-	warning, noExplanation := configKitDiagnostics("app", nil, []configkit.Diagnostic{{Severity: configkit.SeverityWarning, Message: "safe warning"}})
+	warning, noExplanation := AdaptDiagnostics("scope:\n", nil, []configkit.Diagnostic{{Severity: configkit.SeverityWarning, Message: "safe warning"}})
 	if len(warning) != 1 || warning[0].Severity != commandkit.SeverityWarning {
 		t.Fatalf("warning diagnostics = %#v", warning)
 	}
 	if noExplanation.Message != "" || len(noExplanation.Details) != 0 {
 		t.Fatalf("warning-only explanation = %#v", noExplanation)
 	}
-	withWarning, withExplanation := configKitDiagnostics("app", nil, []configkit.Diagnostic{
+	withWarning, withExplanation := AdaptDiagnostics("scope:\n", nil, []configkit.Diagnostic{
 		{Severity: configkit.SeverityWarning, Message: "safe warning"},
 		{Severity: configkit.SeverityError, Message: "safe error"},
 	})
 	if len(withWarning) != 1 || withWarning[0].Severity != commandkit.SeverityWarning || len(withExplanation.Details) != 1 {
 		t.Fatalf("mixed diagnostics = %#v, explanation = %#v", withWarning, withExplanation)
 	}
+	if empty, explanation := AdaptDiagnostics("unused", nil, nil); len(empty) != 0 || len(explanation.Details) != 0 {
+		t.Fatalf("empty evidence = %#v, %#v", empty, explanation)
+	}
 
 	if err := withWarning[0].Write(shortWriter{}); !errors.Is(err, io.ErrShortWrite) {
 		t.Fatalf("short writer error = %v, want %v", err, io.ErrShortWrite)
@@ -280,10 +283,11 @@ func TestConfigKitTerminalContextRetainsRelatedLocationsAndSnapshots(t *testing.
 		Primary:  primary,
 		Related:  related,
 	}}
-	_, explanation := configKitDiagnostics("app", sources, records)
+	_, explanation := AdaptDiagnostics("Configuration scope \"app\":\n", sources, records)
 	primary.SourceID = "mutated-primary"
 	related[0].SourceID = "mutated-related"
 	sources[0].Path = "mutated.yml"
+	records[0].Message = "mutated message"
 
 	if len(explanation.Details) != 1 {
 		t.Fatalf("explanation = %#v", explanation)
@@ -297,7 +301,7 @@ func TestConfigKitTerminalContextRetainsRelatedLocationsAndSnapshots(t *testing.
 			t.Errorf("terminal context %q omits %q", output.String(), fragment)
 		}
 	}
-	if strings.Contains(output.String(), "mutated-") || strings.Contains(output.String(), "mutated.yml") {
+	if strings.Contains(output.String(), "mutated-") || strings.Contains(output.String(), "mutated.yml") || strings.Contains(output.String(), "mutated message") {
 		t.Fatalf("terminal renderer retained caller mutations: %q", output.String())
 	}
 }