fix: validate complete immutable release surface

scripts/verify-hosting-headers.mjs

@@ -7,6 +7,11 @@ const securityPolicy = JSON.parse(
   await readFile("config/hosting/security-headers.json", "utf8"),
 );
 const baseUrl = process.env.HOSTING_BASE_URL;
+const distFiles = (await readdir("dist", { recursive: true })).map(String);
+const publicSourceMaps = distFiles.filter((file) => file.endsWith(".map"));
+const publicServiceWorkers = distFiles.filter((file) =>
+  /(?:^|\/)(?:service-worker|sw)(?:[.-][^/]*)?\.js$/i.test(file),
+);
 
 /** @type {Record<string, Record<string, string>>} */
 let responses;
@@ -81,15 +86,19 @@ results.push({
   surface: "sourceMap",
   header: "public",
   expected: false,
-  observed: cachePolicy.surfaces.sourceMap.public,
-  passed: cachePolicy.surfaces.sourceMap.public === false,
+  observed: publicSourceMaps.length > 0,
+  passed:
+    cachePolicy.surfaces.sourceMap.public === false &&
+    publicSourceMaps.length === 0,
 });
 results.push({
   surface: "serviceWorker",
   header: "enabled",
   expected: false,
-  observed: cachePolicy.surfaces.serviceWorker.enabled,
-  passed: cachePolicy.surfaces.serviceWorker.enabled === false,
+  observed: publicServiceWorkers.length > 0,
+  passed:
+    cachePolicy.surfaces.serviceWorker.enabled === false &&
+    publicServiceWorkers.length === 0,
 });
 
 const passed = results.every((result) => result.passed);

scripts/verify-release.mjs

@@ -2,7 +2,10 @@ import { createHash } from "node:crypto";
 import { mkdir, readFile, writeFile } from "node:fs/promises";
 
 import { verifyCompatibilityTuple } from "../src/application/policies/compatibility.js";
-import { compareReleaseToRuntime } from "../src/contracts/release-tokens.js";
+import {
+  compareReleaseToRuntime,
+  RELEASE_TOKEN_REGISTRY,
+} from "../src/contracts/release-tokens.js";
 
 const fixturesDocument =
   /** @type {{
@@ -38,6 +41,14 @@ const actualAssetManifestHash = createHash("sha256")
 
 const artifactComparison = compareReleaseToRuntime(release, runtimeConfig);
 const artifactMismatches = [...artifactComparison.mismatches];
+for (const token of Object.keys(RELEASE_TOKEN_REGISTRY)) {
+  if (typeof release[token] !== "string" || release[token].length === 0) {
+    artifactMismatches.push(`releaseToken:${token}`);
+  }
+}
+if (!Number.isFinite(Date.parse(release.builtAt))) {
+  artifactMismatches.push("releaseToken:builtAtFormat");
+}
 if (release.assetManifestHash !== actualAssetManifestHash) {
   artifactMismatches.push("assetManifestContent");
 }