fix: spawn Apple /bin/chmod by absolute path when hardening credentials

The macOS credential hardener strips ACLs with `chmod -N`, spawning
`chmod` by bare name. On machines where Nix home-manager or Homebrew
coreutils sit ahead of /bin on PATH, that resolves to GNU chmod, which
has no `-N` flag and exits non-zero. The hardener treated that as a
failure and refused every save from the Provider Settings panel with
"could not restrict the credential file to your account; nothing was
saved".

Spawn /bin/chmod by absolute path instead, matching how the Windows
branch already resolves its native tools without consulting PATH, and
add a regression test that pins the absolute path.

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 read 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;

src/keySetupHardening.test.mjs

@@ -55,6 +55,21 @@ test('macOS ACL removal failure stops before chmod and fails closed', () => {
   assert.deepEqual(fileSystem.calls, [], 'mode bits must not disguise an ACL-removal failure');
 });
 
+test('macOS ACL removal spawns Apple /bin/chmod by absolute path, not via PATH', () => {
+  const spawned = [];
+  hardenCredentialFile(FILE, {
+    platform: 'darwin',
+    fileSystem: fileSystemWithMode(0o100600),
+    spawn(command, args) {
+      spawned.push([command, args]);
+      return { status: 0, signal: null };
+    },
+  });
+  // A coreutils-first PATH (Nix home-manager, Homebrew) resolves bare `chmod`
+  // to GNU chmod, which has no `-N` and would fail every save.
+  assert.deepEqual(spawned, [['/bin/chmod', ['-N', FILE]]]);
+});
+
 test('POSIX hardening verifies the resulting 0600 mode', () => {
   const goodFs = fileSystemWithMode(0o100600);
   assert.equal(hardenCredentialFile(FILE, {