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

@@ -806,6 +806,62 @@
         "etunel-role-collaboration": "用于 Etunel 多 Agent 项目的角色识别、Hub 中介、依赖任务波次、正式成果、人类负责人确认、阶段交接和消息流程协作。"
       }
     },
+    {
+      "id": "hardware-development",
+      "repo": "https://git.playones.com/xufeng/hardware-development.git",
+      "releaseChannel": "latest-stable",
+      "releaseProvider": "gitea",
+      "adapter": "claude-skill",
+      "pluginName": "hardware-development",
+      "category": "Developer Tools",
+      "skillPath": ".",
+      "sparseCheckout": [
+        "SKILL.md",
+        "agents",
+        "references"
+      ],
+      "brandColor": "#0F766E",
+      "manifestOverrides": {
+        "description": "以 KiCad 为主的电子硬件开发流程，覆盖电路实施、PCB 布局布线、验证和制造交付。",
+        "author": {
+          "name": "xufeng",
+          "url": "https://git.playones.com/xufeng"
+        },
+        "homepage": "https://git.playones.com/xufeng/hardware-development",
+        "repository": "https://git.playones.com/xufeng/hardware-development.git",
+        "license": "UNKNOWN",
+        "keywords": [
+          "hardware-development",
+          "kicad",
+          "pcb",
+          "schematic",
+          "manufacturing"
+        ],
+        "interface": {
+          "displayName": "硬件开发",
+          "shortDescription": "以 KiCad 完成电路、PCB、验证和制造交付。",
+          "longDescription": "以 KiCad 为主要执行工具，支持 Cadence/OrCAD 既有电路输入，覆盖工程基准、器件依据、原理图转换、封装与网表核对、功能布局、布线验收、DRC 和 Gerber 制造交付。",
+          "developerName": "xufeng",
+          "category": "Developer Tools",
+          "capabilities": [
+            "Interactive",
+            "Read",
+            "Write"
+          ],
+          "defaultPrompt": [
+            "使用硬件开发 Skill 确定当前工程和有效约束，推进本次硬件设计阶段。",
+            "使用硬件开发 Skill 审查这个 KiCad PCB 工程并给出可追溯的验证结果。"
+          ],
+          "websiteURL": "https://git.playones.com/xufeng/hardware-development",
+          "privacyPolicyURL": "https://git.playones.com/xufeng/hardware-development",
+          "termsOfServiceURL": "https://git.playones.com/xufeng/hardware-development",
+          "brandColor": "#0F766E"
+        }
+      },
+      "skillDescriptions": {
+        "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": "next-skills",
       "repo": "https://github.com/vercel/next.js.git",