fix: isolate artifact rebuild from release suites

release-gate/runner.mjs

@@ -72,6 +72,30 @@ export async function runWithConcurrency(items, concurrency, worker) {
   return results;
 }
 
+// Some suites intentionally mutate the shared candidate artifact. Run those
+// suites before the parallel batch so they cannot race suites that boot the
+// same runtime while it is being rebuilt.
+export async function runSuitesWithConcurrency(items, concurrency, worker) {
+  const results = new Array(items.length);
+  const parallel = [];
+  for (let index = 0; index < items.length; index += 1) {
+    if (items[index].exclusive) {
+      results[index] = await worker(items[index], index);
+    } else {
+      parallel.push({ item: items[index], index });
+    }
+  }
+  const parallelResults = await runWithConcurrency(
+    parallel,
+    concurrency,
+    ({ item, index }) => worker(item, index),
+  );
+  for (let index = 0; index < parallel.length; index += 1) {
+    results[parallel[index].index] = parallelResults[index];
+  }
+  return results;
+}
+
 export async function runCommand(command, args, {
   cwd = ROOT,
   timeoutMs = 15 * 60 * 1000,
@@ -220,7 +244,7 @@ export async function executeReleaseGate(options) {
   );
 
   const suites = AUTOMATION_SUITES.filter((candidate) => suiteIsInMode(candidate, options.mode));
-  const executions = await runWithConcurrency(
+  const executions = await runSuitesWithConcurrency(
     suites,
     options.suiteConcurrency,
     (suite) => runSuite(suite, outputDir, options.timeoutMs),