fix(tests): use array form for space-containing paths in CLI invocations

On machines where os.tmpdir() returns a path with a space (e.g.
/Volumes/Mini Me/tmp), runGsdTools() string args were whitespace-split by
the helper tokeniser, truncating paths at the first space.  Switch all
calls that embed a dynamic path into the argument list to the array form
of runGsdTools() so execFileSync receives each path as a single argv slot.

Fixes #3509

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/commands.test.cjs

@@ -1031,7 +1031,7 @@ describe('verify-path-exists command', () => {
     const absFile = path.join(tmpDir, 'abs-test.txt');
     fs.writeFileSync(absFile, 'content');
 
-    const result = runGsdTools(`verify-path-exists ${absFile}`, tmpDir);
+    const result = runGsdTools(['verify-path-exists', absFile], tmpDir);
     assert.ok(result.success, `Command failed: ${result.error}`);
 
     const output = JSON.parse(result.output);