fix(KAN-65): recover verified S3 writes from empty error responses

native/publish-macos.mjs

@@ -63,6 +63,14 @@ export function storageConfiguration(env = process.env) {
 
 const sha256 = (data) => createHash('sha256').update(data).digest('hex');
 
+function requiresExistingObjectCheck(error) {
+    // AWS CLI can crash while formatting Hetzner's empty error Message.
+    // This only permits a readback; content checks and conditional writes still apply.
+    return /\(PreconditionFailed\)|\(412\)|argument of type 'NoneType' is not (?:a container or )?iterable/.test(
+        error.message,
+    );
+}
+
 export async function publishMacos({
     env = process.env,
     directory,
@@ -116,13 +124,21 @@ export async function publishMacos({
         's3api',
     ];
     function s3(operation, args) {
-        return run('aws', [
-            ...common,
-            operation,
-            '--bucket',
-            storage.bucket,
-            ...args,
-        ]);
+        try {
+            return run('aws', [
+                ...common,
+                operation,
+                '--bucket',
+                storage.bucket,
+                ...args,
+            ]);
+        } catch (error) {
+            const keyIndex = args.indexOf('--key');
+            const key = keyIndex >= 0 ? ` ${args[keyIndex + 1]}` : '';
+            throw new Error(`S3 ${operation}${key}: ${error.message}`, {
+                cause: error,
+            });
+        }
     }
     const versioningOutput = s3('get-bucket-versioning', [
         '--output',
@@ -213,7 +229,7 @@ export async function publishMacos({
                 `sha256=${sha256(contents)}`,
             ]);
         } catch (error) {
-            if (!/\(PreconditionFailed\)|\(412\)/.test(error.message)) {
+            if (!requiresExistingObjectCheck(error)) {
                 throw error;
             }
             const existing = join(staging, `existing-${name}`);
@@ -301,7 +317,7 @@ export async function publishMacos({
         try {
             publishLatest(['--if-none-match', '*']);
         } catch (error) {
-            if (!/\(PreconditionFailed\)|\(412\)/.test(error.message)) {
+            if (!requiresExistingObjectCheck(error)) {
                 throw error;
             }
             const previousFile = join(staging, 'previous-latest.json');