Add gitkraken plugin (#4290)

.claude-plugin/marketplace.json

@@ -1510,6 +1510,20 @@
       "source": "./external_plugins/github",
       "homepage": "https://github.com/anthropics/claude-plugins-public/tree/main/external_plugins/github"
     },
+    {
+      "name": "gitkraken",
+      "description": "Gives Claude access to your real Git and project context: commits, branches, pull requests, and issues across every repo you work in. Works with GitHub, GitLab, Azure DevOps, Bitbucket, and Jira.",
+      "author": {
+        "name": "GitKraken"
+      },
+      "category": "development",
+      "source": {
+        "source": "url",
+        "url": "https://github.com/gitkraken/claude-plugin.git",
+        "sha": "cd0c2976c9b47a56e2b7d4cce1cd77fc058bee39"
+      },
+      "homepage": "https://www.gitkraken.com"
+    },
     {
       "name": "gitlab",
       "description": "GitLab DevOps platform integration. Manage repositories, merge requests, CI/CD pipelines, issues, and wikis. Full access to GitLab's comprehensive DevOps lifecycle tools.",