Bump open-codex to 0.129.15

Prepare the release that includes lightweight /btw side questions and the npm download status CLI.\n\nThe public npm latest version before publishing is 0.129.13, so this release advances the package to 0.129.15 after the local 0.129.14 bump.

Author: LEON-gittech

codex-cli/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@leonw24/open-codex",
-  "version": "0.129.14",
+  "version": "0.129.15",
   "license": "Apache-2.0",
   "bin": {
     "open-codex": "bin/codex.js"