feat(core-shared/conformance): barrel + ./conformance subpath export

packages/core-shared/src/conformance/index.ts

@@ -0,0 +1,4 @@
+export type { Instrumented, Captured } from "./brands";
+export type { FeatureManifest, UseCaseManifest } from "./define-feature";
+export { defineFeature } from "./define-feature";
+export type { ProductionUseCase } from "./production-use-case";