fix: preserve artifact writer failures

tests/unit/json-schema.test.ts

@@ -198,6 +198,40 @@ describe("checked-in JSON Schema execution", () => {
           fixture.name,
         ),
       ).toThrow(/checked-in JSON Schema/u);
+      expect(() =>
+        assertMatchesJsonSchema(
+          schema,
+          {
+            ...fixture.value,
+            dependencyCount: 0,
+            directDependencyCount: 0,
+            dependencies: [],
+          },
+          fixture.name,
+        ),
+      ).toThrow(/checked-in JSON Schema/u);
+    }
+    if (fixture.name === "registry snapshot") {
+      expect(() =>
+        assertMatchesJsonSchema(
+          schema,
+          { ...fixture.value, failures: [], registries: [] },
+          fixture.name,
+        ),
+      ).toThrow(/checked-in JSON Schema/u);
+      expect(() =>
+        assertMatchesJsonSchema(
+          schema,
+          {
+            ...fixture.value,
+            baselineDigest: null,
+            compatibility: { impact: "not-evaluated", changes: [] },
+            failures: ["missing registry source"],
+            registries: [],
+          },
+          fixture.name,
+        ),
+      ).not.toThrow();
     }
   });
 });