fix: use relative path './' for plugin source instead of GitHub object

Using './' lets Claude Code use the already-cloned marketplace repo
directly instead of fetching from GitHub again. This avoids potential
double-fetch issues and simplifies the installation.

.claude-plugin/marketplace.json

@@ -11,10 +11,7 @@
   "plugins": [
     {
       "name": "everything-claude-code",
-      "source": {
-        "source": "github",
-        "repo": "affaan-m/everything-claude-code"
-      },
+      "source": "./",
       "description": "Complete collection of agents, skills, hooks, commands, and rules evolved over 10+ months of intensive daily use",
       "version": "1.0.0",
       "author": {