fix: correct bundle skill paths in Codex plugin manifest (#91)

The generator used File.basename which stripped the bundles/ prefix,
emitting ./neckbeard instead of ./bundles/neckbeard. Codex discovered
92/96 skills — the 4 bundle entrypoints were missing because their
paths didn't resolve.

Verified with live Codex CLI: all 96 skills now discoverable.

AI-assisted: yes (Jasper/Hermes Agent)

scripts/gen-codex-plugin.rb

@@ -26,7 +26,7 @@ PUBLIC_SKILLS = (Dir.glob("#{ROOT}/*/SKILL.md") + Dir.glob("#{ROOT}/bundles/*/SK
 
 def build_plugin_json
   skill_paths = PUBLIC_SKILLS.map do |skill|
-    "./#{File.basename(File.dirname(skill))}"
+    "./#{File.dirname(skill).delete_prefix("#{ROOT}/")}"
   end.sort
 
   {