fix: unify release runtime coherence verification

src/contracts/release-tokens.ts

@@ -42,33 +42,23 @@ export function compareReleaseToRuntime(
   release: Readonly<{
     buildId: string;
     configSchemaVersion: string;
-    apiContractVersion?: string;
+    apiContractVersion: string;
     assetManifestHash: string;
     releaseId: string;
   }>,
   runtimeConfig: Readonly<{
     BUILD_ID: string;
     CONFIG_SCHEMA_VERSION: string;
-    /**
-     * §5.1. Removed from Runtime Config V2. When neither side declares it there
-     * is nothing to disagree about: contract identity is verified by the
-     * Release Manifest V2 `contractSet` check instead.
-     */
-    API_CONTRACT_VERSION?: string;
+    API_CONTRACT_VERSION: string;
     RELEASE_ID: string;
   }>,
 ) {
-  const declaredContractVersion =
-    runtimeConfig.API_CONTRACT_VERSION ?? release.apiContractVersion ?? "0";
   return verifyCompatibilityTuple({
-    frontend: {
-      ...release,
-      apiContractVersion: release.apiContractVersion ?? declaredContractVersion,
-    },
+    frontend: release,
     runtime: {
       buildId: runtimeConfig.BUILD_ID,
       configSchemaVersion: runtimeConfig.CONFIG_SCHEMA_VERSION,
-      apiContractVersion: declaredContractVersion,
+      apiContractVersion: runtimeConfig.API_CONTRACT_VERSION,
       assetManifestHash: release.assetManifestHash,
       releaseId: runtimeConfig.RELEASE_ID,
     },