fix(release): make checksum manifest portable

docs/releasing.md

@@ -19,7 +19,7 @@ The exact order and ownership of static, contract, artifact/runtime, browser, se
 
 `index.html` and `sbom.spdx.json` are tracked, reproducible release evidence. Versioned `dist/` artifacts, `SHA256SUMS`, and the temporary Pages `_site/` tree are generated outputs and must not be committed as release history.
 
-Generate and verify the portable checksum file with `npm run generate:release-checksums` and `npm run validate:release-assets`. After publication, verify provenance with `gh attestation verify dist/hSQLite-Editor-v<version>.html --repo <owner>/<repository>`. Verify the associated SPDX predicate by adding `--predicate-type https://spdx.dev/Document/v2.3`.
+Generate and verify the portable checksum file with `npm run generate:release-checksums` and `npm run validate:release-assets`. Published checksum entries use release asset basenames, so users can download the HTML, SBOM, and `SHA256SUMS` into one directory and run `shasum -a 256 -c SHA256SUMS`. After publication, verify provenance with `gh attestation verify dist/hSQLite-Editor-v<version>.html --repo <owner>/<repository>`. Verify the associated SPDX predicate by adding `--predicate-type https://spdx.dev/Document/v2.3`.
 
 Immutable release publication is atomic: create the exact tag and draft, build from that tag, validate, attest, upload the complete asset bundle, then publish. The workflow forbids `--clobber`. If upload is partial or an asset-name conflict occurs, delete and recreate the unpublished draft after diagnosing the cause; never repair a release by overwriting an asset.
 

scripts/contract-tests/release-utils.test.mjs

@@ -6,6 +6,7 @@ import {
   escapeRegExp,
   extractInlineScripts,
   extractMarkupText,
+  formatReleaseChecksumLine,
   getReleaseArtifactPath,
   getReleaseTag
 } from "../release-utils.mjs";
@@ -75,3 +76,20 @@ test("release tuple helpers reject unsafe package names and versions", () => {
     assert.throws(() => assertReleasePackageName(packageName), /Invalid release package name/);
   }
 });
+
+test("release checksum lines use flat public asset names", () => {
+  const digest = "a".repeat(64);
+
+  assert.equal(
+    formatReleaseChecksumLine("/tmp/release/dist/hSQLite-Editor-v0.6.1.html", digest),
+    `${digest}  hSQLite-Editor-v0.6.1.html`
+  );
+  assert.equal(
+    formatReleaseChecksumLine("/tmp/release/sbom.spdx.json", digest),
+    `${digest}  sbom.spdx.json`
+  );
+  assert.throws(
+    () => formatReleaseChecksumLine("/tmp/release/SHA256SUMS", "not-a-digest"),
+    /Invalid SHA-256 digest/
+  );
+});

scripts/release-assets.mjs

@@ -1,7 +1,11 @@
 import crypto from "node:crypto";
 import fs from "node:fs";
 import path from "node:path";
-import { getReleaseArtifactPath, getReleaseTag } from "./release-utils.mjs";
+import {
+  formatReleaseChecksumLine,
+  getReleaseArtifactPath,
+  getReleaseTag
+} from "./release-utils.mjs";
 
 const rootDir = path.resolve(new URL("..", import.meta.url).pathname);
 const checkOnly = process.argv.includes("--check");
@@ -38,7 +42,7 @@ if (sbom.spdxVersion !== "SPDX-2.3" || sbom.documentNamespace !== expectedNamesp
 
 const checksumText = subjects.map(subjectPath => {
   const digest = crypto.createHash("sha256").update(fs.readFileSync(subjectPath)).digest("hex");
-  return `${digest}  ${path.relative(rootDir, subjectPath)}`;
+  return formatReleaseChecksumLine(subjectPath, digest);
 }).join("\n") + "\n";
 
 if (checkOnly) {

scripts/release-utils.mjs

@@ -205,6 +205,19 @@ export function getReleaseArtifactPath(rootDir, version) {
   return path.join(rootDir, "dist", `hSQLite-Editor-v${assertStableReleaseVersion(version)}.html`);
 }
 
+export function formatReleaseChecksumLine(subjectPath, digest) {
+  const normalizedDigest = String(digest ?? "");
+  if (!/^[a-f0-9]{64}$/.test(normalizedDigest)) {
+    throw new Error(`Invalid SHA-256 digest: ${JSON.stringify(normalizedDigest)}`);
+  }
+
+  const assetName = path.basename(String(subjectPath ?? ""));
+  if (!assetName || assetName === "." || assetName === "..") {
+    throw new Error(`Invalid release asset path: ${JSON.stringify(subjectPath)}`);
+  }
+  return `${normalizedDigest}  ${assetName}`;
+}
+
 export function getReleaseTag(packageName, version) {
   return `${assertReleasePackageName(packageName)}-v${assertStableReleaseVersion(version)}`;
 }