feat(plugin-catalog): add GitHub App connector

plugin-catalog/github_app.yaml

@@ -0,0 +1,23 @@
+name: github_app
+repo: https://github.com/himanusia/hermes-github-app-plugin
+sha: 2adfd020f93a5d71a563e94c88738fb8e64335f8
+subdir: github_app
+version: "0.1.0"
+description: GitHub and GitHub Enterprise tools with bot-first attribution and approval-gated issue/PR writes.
+maintainer: himanusia
+tier: community
+category: tools
+readme: true
+capabilities:
+  provides_tools:
+    - github_identity
+    - github_create_issue
+    - github_comment_issue
+    - github_list_issues
+    - github_get_issue
+    - github_review_pr
+    - github_merge_pr
+  provides_hooks:
+    - pre_tool_call
+  provides_middleware: []
+  requires_env: []