fix: use string array format for skills path

Claude Code requires skills paths as string array with ./ prefix.
Changed from object format to: ["./skills/github-project"]

Author: CybotTM

.claude-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "github-project",
-  "version": "1.3.1",
+  "version": "1.3.2",
   "description": "GitHub repository setup, branch protection, and configuration",
   "repository": "https://github.com/netresearch/github-project-skill",
   "license": "MIT",
@@ -9,9 +9,6 @@
     "email": "[email protected]"
   },
   "skills": [
-    {
-      "name": "github-project",
-      "path": "skills/github-project"
-    }
+    "./skills/github-project"
   ]
 }