feat: compose executable frontend runtime

tests/runtime-schema/release-manifest.test.js

@@ -0,0 +1,51 @@
+import { describe, expect, it } from "vitest";
+
+import {
+  loadReleaseManifest,
+  ReleaseManifestError,
+} from "../../src/bootstrap/load-release-manifest.js";
+
+const runtime = {
+  build: { buildId: "build-a" },
+  config: {
+    RELEASE_MANIFEST_URL: "/release-manifest.json",
+    BUILD_ID: "build-a",
+    RELEASE_ID: "release-a",
+    CONFIG_SCHEMA_VERSION: "1",
+    API_CONTRACT_VERSION: "1",
+  },
+};
+const manifest = {
+  schemaVersion: 1,
+  appVersion: "0.1.0",
+  buildId: "build-a",
+  commitSha: "abc123",
+  configSchemaVersion: "1",
+  apiContractVersion: "1",
+  assetManifestHash: "hash-a",
+  releaseId: "release-a",
+  builtAt: "2026-07-25T00:00:00Z",
+};
+
+describe("release manifest boot boundary", () => {
+  it("loads a coherent release tuple", async () => {
+    await expect(
+      loadReleaseManifest(
+        /** @type {Parameters<typeof loadReleaseManifest>[0]} */ (runtime),
+        { fetcher: async () => new Response(JSON.stringify(manifest)) },
+      ),
+    ).resolves.toMatchObject({ releaseId: "release-a" });
+  });
+
+  it("fails before mount when release and runtime differ", async () => {
+    await expect(
+      loadReleaseManifest(
+        /** @type {Parameters<typeof loadReleaseManifest>[0]} */ (runtime),
+        {
+          fetcher: async () =>
+            new Response(JSON.stringify({ ...manifest, buildId: "build-b" })),
+        },
+      ),
+    ).rejects.toBeInstanceOf(ReleaseManifestError);
+  });
+});

tests/runtime-schema/runtime-config.test.js

@@ -35,6 +35,20 @@ describe("runtime configuration boundary", () => {
     );
   });
 
+  it("allows demo authentication only for local runtime configuration", () => {
+    expect(
+      validateRuntimeConfig({ ...validConfig, AUTH_MODE: "demo" }).success,
+    ).toBe(true);
+    expect(
+      validateRuntimeConfig({
+        ...validConfig,
+        APP_ENV: "production",
+        API_BASE_URL: "https://api.example.test",
+        AUTH_MODE: "demo",
+      }).success,
+    ).toBe(false);
+  });
+
   it("validates a fetched config under the 500ms budget excluding network", async () => {
     let current = 100;
     const result = await loadRuntimeConfig({