fix: 修正審查員 P1-P6 全部問題

P1/P2: 為所有 53 個 SKILL.md 補明確 slug frontmatter，解決 importer slug 衝突
P3: 新增 .mcp.json，補 .paperclip.yaml envInputs
P4: agent-skill-mapping.md 補摘要版說明
P5: 修正文檔統計數字（53 skills，非 62）
P6: 清除 mcp-plan.md 敏感資訊與機器相依路徑

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

.paperclip.yaml

@@ -80,6 +80,14 @@ agents:
         model: claude-sonnet-4-6
     status: paused
 
+envInputs:
+  - name: FRED_API_KEY
+    description: FRED (Federal Reserve Economic Data) API key — get free key at fred.stlouisfed.org
+    required: false
+  - name: FUGLE_API_KEY
+    description: Fugle MarketData API key for Taiwan stock market data — get at developer.fugle.tw
+    required: false
+
 projects:
   daily-quant-pipeline:
     leadAgentSlug: quant-strategist