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

@@ -765,7 +765,7 @@
       ],
       "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。",
+        "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七列任务表。",
         "author": {
           "name": "hejunxian",
           "url": "https://git.playones.com/hejunxian"
@@ -776,14 +776,14 @@
         "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。",
+          "shortDescription": "筛选 Android 用例，生成可追溯的七列 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 模板生成七列 ARTEMIS 任务文档。只准备文档，不运行批次；导入前请检查表头与当前 ARTEMIS 版本是否匹配。",
           "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。"
+            "使用 artemis-case-prep 从原始工作簿准备七列任务表。"
           ],
           "websiteURL": "https://git.playones.com/hejunxian/artemis-case-prep",
           "privacyPolicyURL": "https://git.playones.com/hejunxian/artemis-case-prep",