fix: correct URLs, author name, and clean up stale hook

- Revert plugin/README/CONTRIBUTING URLs to git.jagfly.com (not on GitHub yet)
- Fix LICENSE copyright to Sheldon Finlay
- Remove leftover Stop hook from settings.local.json

.claude-plugin/marketplace.json

@@ -14,7 +14,7 @@
       "author": {
         "name": "Sheldon"
       },
-      "repository": "https://github.com/sheldonchiu/agent-loop",
+      "repository": "https://git.jagfly.com/sheldon/loop-loop",
       "license": "MIT",
       "keywords": ["agent", "loop", "autonomous", "generator", "evaluator", "harness"],
       "category": "workflow"