fix: source path must start with ./

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.claude-plugins/projman-marketplace/.claude-plugin/marketplace.json

@@ -9,7 +9,7 @@
       "name": "projman",
       "version": "0.1.0",
       "description": "Sprint planning and project management with Gitea and Wiki.js integration",
-      "source": "../../projman"
+      "source": "./../../projman"
     }
   ]
 }