fix: add owner field and schema to marketplace.json

.claude-plugin/marketplace.json

@@ -1,14 +1,23 @@
 {
+  "$schema": "https://anthropic.com/claude-code/marketplace.schema.json",
   "name": "agent-loop",
+  "description": "Autonomous generator-evaluator agent loop for long-running coding tasks",
+  "owner": {
+    "name": "Sheldon"
+  },
   "plugins": [
     {
       "name": "agent-loop",
+      "source": "./",
       "description": "Autonomous generator-evaluator agent loop for long-running coding tasks. Plan interactively, then execute with full visibility.",
       "version": "0.1.0",
-      "source": {
-        "source": "github",
-        "repo": "https://git.jagfly.com/sheldon/loop-loop.git"
-      }
+      "author": {
+        "name": "Sheldon"
+      },
+      "repository": "https://git.jagfly.com/sheldon/loop-loop",
+      "license": "MIT",
+      "keywords": ["agent", "loop", "autonomous", "generator", "evaluator", "harness"],
+      "category": "workflow"
     }
   ]
 }