refactor: 消灭 skill.json，SKILL.md 成为唯一真相源

- 将 skill.json 中的 icon、shortDesc、category、maintainer、
  compatibleAgents、channel 迁移到 SKILL.md frontmatter 的 market 段
- 将 skill.json 中的 changelog 字段提取为独立 CHANGELOG.md
- 删除所有 skill.json（downloads/rating/ratingCount 等虚假数据一并移除）
- 版本号统一从 SKILL.md frontmatter version 读取

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

skills/discover-agent/CHANGELOG.md

@@ -0,0 +1,5 @@
+# Changelog
+
+## [2.1.0] - 2026-02-26
+
+- 移除 fetch_api 依赖，改为通过 Bash/curl 调用 HTTP API；API 地址由 system prompt 注入

skills/discover-agent/SKILL.md

@@ -1,16 +1,38 @@
 ---
 name: discover-agent
 description: 根据用户需求推荐最匹配的智能体，展示候选列表并引导选择。Use when 用户描述需求但不确定该找哪个智能体帮忙，或想浏览可用的智能体。
-version: "2.1.0"
+version: 2.1.0
 type: procedural
 risk_level: low
 status: enabled
 disable-model-invocation: false
-tags: [agent, discovery, recommendation]
+tags:
+  - agent
+  - discovery
+  - recommendation
 metadata:
   author: desirecore
-  version: "2.1.0"
-  updated_at: "2026-02-26"
+  version: 2.1.0
+  updated_at: '2026-02-26'
+market:
+  icon: >-
+    <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0
+    24 24" fill="none"><defs><linearGradient id="da-a" x1="2" y1="2" x2="22"
+    y2="22" gradientUnits="userSpaceOnUse"><stop stop-color="#AF52DE"
+    stop-opacity="0.12"/><stop offset="1" stop-color="#007AFF"
+    stop-opacity="0.06"/></linearGradient></defs><circle cx="12" cy="12" r="10"
+    fill="url(#da-a)" stroke="#AF52DE" stroke-width="1.5"/><path d="M16.24
+    7.76l-1.8 5.41a2 2 0 0 1-1.27 1.27L7.76 16.24" fill="#FF9500"
+    fill-opacity="0.85"/><path d="M7.76 16.24l1.8-5.41a2 2 0 0 1 1.27-1.27L16.24
+    7.76" fill="#AF52DE" fill-opacity="0.7"/><circle cx="12" cy="12" r="1.5"
+    fill="white" stroke="#AF52DE" stroke-width="0.8"/></svg>
+  short_desc: 根据需求描述智能推荐最匹配的智能体，引导快速选择
+  category: productivity
+  maintainer:
+    name: DesireCore Official
+    verified: true
+  compatible_agents: []
+  channel: latest
 ---
 
 # discover-agent 技能

skills/discover-agent/skill.json

@@ -1,32 +0,0 @@
-{
-  "id": "discover-agent",
-  "name": "发现智能体",
-  "icon": "<svg xmlns=\"http://www.w3.org/2000/svg\" width=\"24\" height=\"24\" viewBox=\"0 0 24 24\" fill=\"none\"><defs><linearGradient id=\"da-a\" x1=\"2\" y1=\"2\" x2=\"22\" y2=\"22\" gradientUnits=\"userSpaceOnUse\"><stop stop-color=\"#AF52DE\" stop-opacity=\"0.12\"/><stop offset=\"1\" stop-color=\"#007AFF\" stop-opacity=\"0.06\"/></linearGradient></defs><circle cx=\"12\" cy=\"12\" r=\"10\" fill=\"url(#da-a)\" stroke=\"#AF52DE\" stroke-width=\"1.5\"/><path d=\"M16.24 7.76l-1.8 5.41a2 2 0 0 1-1.27 1.27L7.76 16.24\" fill=\"#FF9500\" fill-opacity=\"0.85\"/><path d=\"M7.76 16.24l1.8-5.41a2 2 0 0 1 1.27-1.27L16.24 7.76\" fill=\"#AF52DE\" fill-opacity=\"0.7\"/><circle cx=\"12\" cy=\"12\" r=\"1.5\" fill=\"white\" stroke=\"#AF52DE\" stroke-width=\"0.8\"/></svg>",
-  "shortDesc": "根据需求描述智能推荐最匹配的智能体，引导快速选择",
-  "fullDesc": "发现智能体是一个流程型技能，帮助用户在已注册的 Agent 中找到最合适的助手。通过语义理解用户需求，多维度匹配评分，展示候选列表并引导选择。无匹配时自动衔接创建流程。\n\n功能特性：\n- 语义匹配：基于描述相似度、技能匹配、领域匹配等多维度评分\n- 智能排序：综合得分降序，在线状态优先\n- 浏览模式：支持查看所有可用智能体\n- 流畅衔接：无匹配时自动建议创建新 Agent\n- 上下文传递：选择后自动传递用户需求到目标智能体",
-  "category": "productivity",
-  "tags": [
-    "智能体",
-    "发现",
-    "推荐",
-    "匹配",
-    "导航"
-  ],
-  "version": "2.1.0",
-  "updatedAt": "2026-02-26",
-  "maintainer": {
-    "name": "DesireCore Official",
-    "verified": true
-  },
-  "downloads": 0,
-  "rating": 0,
-  "ratingCount": 0,
-  "installStatus": "not_installed",
-  "riskLevel": "low",
-  "requires": {
-    "tools": [],
-    "connections": []
-  },
-  "compatibleAgents": [],
-  "changelog": "v2.1.0: 移除 fetch_api 依赖，改为通过 Bash/curl 调用 HTTP API；API 地址由 system prompt 注入"
-}