Sync third-party and MCP marketplace plugins

Constraint: Public skills are published only by explicit administrator action unless they are tracked third-party market sources.
Confidence: high
Scope-risk: narrow
Directive: Keep private/internal skills out of the public marketplace and preserve normal incremental market Git history.
Tested: Marketplace validation passed.

config/external-sources.json

@@ -747,6 +747,53 @@
         "hardware-development": "用于以 KiCad 为主的电子硬件开发，包括 Cadence/OrCAD 原理图转换、封装与网表核对、PCB 功能布局、布线验收、DRC 和 Gerber 制造交付。适用于已有电路的实施与审查，不用于纯软件或说明性框图。"
       }
     },
+    {
+      "id": "artemis-case-prep",
+      "repo": "https://git.playones.com/hejunxian/artemis-case-prep.git",
+      "releaseChannel": "latest-stable",
+      "releaseProvider": "gitea",
+      "adapter": "claude-skill",
+      "pluginName": "artemis-case-prep",
+      "category": "Developer Tools",
+      "skillPath": ".",
+      "sparseCheckout": ["SKILL.md", "agents", "references", "assets/artemis-tasks.xlsx"],
+      "marketAssets": [
+        {
+          "source": "config/assets/artemis-case-prep.svg",
+          "destination": "assets/icon.svg"
+        }
+      ],
+      "brandColor": "#177C80",
+      "manifestOverrides": {
+        "description": "从 Android 原始测试工作簿筛选可由 ARTEMIS 自动化的用例，标记原表副本并生成六列任务表。",
+        "author": {
+          "name": "hejunxian",
+          "url": "https://git.playones.com/hejunxian"
+        },
+        "homepage": "https://git.playones.com/hejunxian/artemis-case-prep",
+        "repository": "https://git.playones.com/hejunxian/artemis-case-prep.git",
+        "license": "UNKNOWN",
+        "keywords": ["artemis", "android", "test-case", "workbook", "excel"],
+        "interface": {
+          "displayName": "artemis-case-prep",
+          "shortDescription": "筛选 Android 用例，生成可追溯的六列 ARTEMIS 任务表。",
+          "longDescription": "识别多工作表 Android 原始用例的适用性与自动化边界，保留原表并标记选择结果，按附带 Excel 模板生成六列 ARTEMIS 任务文档。只准备文档，不运行批次；六列模板目前不兼容 ARTEMIS 1.0.1 的七列原生导入器。",
+          "developerName": "hejunxian",
+          "category": "Developer Tools",
+          "capabilities": ["Interactive", "Read", "Write"],
+          "defaultPrompt": [
+            "使用 artemis-case-prep 检查这份测试用例是否具备转换条件。",
+            "使用 artemis-case-prep 从原始工作簿准备六列任务表。"
+          ],
+          "websiteURL": "https://git.playones.com/hejunxian/artemis-case-prep",
+          "privacyPolicyURL": "https://git.playones.com/hejunxian/artemis-case-prep",
+          "termsOfServiceURL": "https://git.playones.com/hejunxian/artemis-case-prep",
+          "brandColor": "#177C80",
+          "logo": "./assets/icon.svg",
+          "composerIcon": "./assets/icon.svg"
+        }
+      }
+    },
     {
       "id": "artemis-automation",
       "repo": "https://git.playones.com/chenmingxuan/Artemis-Eapil.git",