feat: add removable reference feature vertical slice

src/features/installed-feature-adapters.ts

@@ -0,0 +1,15 @@
+import { createReferenceFeatureInstalledInput } from "./reference-feature/adapters/create-reference-feature-input.js";
+
+export function createInstalledFeatureInputs(
+  context: Parameters<typeof createReferenceFeatureInstalledInput>[0],
+): Readonly<Record<string, unknown>> {
+  const installed = [createReferenceFeatureInstalledInput(context)];
+  return Object.freeze(
+    Object.fromEntries(
+      installed.map((contribution) => [
+        contribution.featureId,
+        contribution.input,
+      ]),
+    ),
+  );
+}