chore(git): 修正範本 manifest 與移除 hello 範例符合 git 領域

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.claude-plugin/marketplace.json

@@ -1,14 +1,14 @@
 {
-  "name": "template",
-  "description": "JSC 跨 AI 助理共用 skills 的 Claude Code marketplace。",
+  "name": "git",
+  "description": "jsc 技能組 git domain 的 marketplace。",
   "owner": {
     "name": "JSC"
   },
   "plugins": [
     {
-      "name": "jsc-template",
+      "name": "jsc-git",
       "source": "./",
-      "description": "JSC 共用 skills（跨 AI 助理）"
+      "description": "Commit 分組認可與 Push Request 建立"
     }
   ]
 }