Fix Codex plugin category

.codex-plugin/plugin.json

@@ -27,7 +27,7 @@
     "shortDescription": "Planning, TDD, debugging, and delivery workflows for coding agents",
     "longDescription": "Use Superpowers to guide agent work through brainstorming, implementation planning, test-driven development, systematic debugging, parallel execution, code review, and finish-the-branch workflows.",
     "developerName": "Jesse Vincent",
-    "category": "Coding",
+    "category": "Developer Tools",
     "capabilities": [
       "Interactive",
       "Read",