fix: raise release subprocess buffer

Issue: #169
User-Visible: no

scripts/release-prerelease.mjs

@@ -15,6 +15,7 @@ import { assertReleaseContract } from './release-contract.mjs';
 import { classifyValidateRuns } from './release-gate.mjs';
 
 const sleep = (ms) => new Promise((done) => setTimeout(done, ms));
+const SUBPROCESS_MAX_BUFFER = 64 * 1024 * 1024;
 
 class ReleaseAssetContentError extends Error {}
 
@@ -192,6 +193,7 @@ if (invokedDirectly) {
     const result = spawnSync(command, commandArgs, {
       cwd,
       encoding: 'utf8',
+      maxBuffer: SUBPROCESS_MAX_BUFFER,
       stdio: inherit ? 'inherit' : ['ignore', 'pipe', 'pipe'],
     });
     if (result.error) throw result.error;
@@ -209,6 +211,7 @@ if (invokedDirectly) {
   const runBytes = (command, commandArgs, { cwd = root } = {}) => {
     const result = spawnSync(command, commandArgs, {
       cwd,
+      maxBuffer: SUBPROCESS_MAX_BUFFER,
       stdio: ['ignore', 'pipe', 'pipe'],
     });
     if (result.error) throw result.error;

test/release-contract.test.mjs

@@ -187,6 +187,18 @@ test('prerelease CLI reports malformed arguments without a raw stack trace', ()
   assert.doesNotMatch(result.stderr, /\n\s+at\s/);
 });
 
+test('prerelease CLI can buffer the committed release bundle', () => {
+  const orchestrator = readFileSync(
+    new URL('../scripts/release-prerelease.mjs', import.meta.url), 'utf8',
+  );
+  assert.match(orchestrator, /SUBPROCESS_MAX_BUFFER = 64 \* 1024 \* 1024/);
+  assert.equal(
+    [...orchestrator.matchAll(/maxBuffer: SUBPROCESS_MAX_BUFFER/g)].length,
+    2,
+    'both text and byte subprocess readers must override the Node default buffer',
+  );
+});
+
 test('manual publish workflow is draft-first, exact-SHA gated and self-contained', () => {
   const workflow = readFileSync(new URL('../.github/workflows/publish-prerelease.yml', import.meta.url), 'utf8');
   for (const required of [