Merge main into pr-722

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>

server/standalone/key-setup-hardening.mjs

@@ -123,7 +123,11 @@ export function hardenCredentialFile(
   if (platform !== 'win32') {
     try {
       if (platform === 'darwin') {
-        const aclRemoval = spawn('chmod', ['-N', filepath], {
+        // `-N` (strip the ACL) is Apple-only. Spawn /bin/chmod by absolute
+        // path, never by name: a Nix/Homebrew coreutils profile puts GNU chmod
+        // first on PATH, and GNU chmod rejects `-N` — which was treated as a
+        // hardening failure and refused every save on such machines.
+        const aclRemoval = spawn('/bin/chmod', ['-N', filepath], {
           stdio: 'ignore',
         });
         if (!commandCompletedSuccessfully(aclRemoval)) return false;