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>

.mcp.json

@@ -0,0 +1,30 @@
+{
+  "mcpServers": {
+    "yahoo-finance": {
+      "command": "uvx",
+      "args": ["yahoo-finance-mcp"]
+    },
+    "fred": {
+      "command": "uvx",
+      "args": ["fred-mcp-server"],
+      "env": {
+        "FRED_API_KEY": "${FRED_API_KEY}"
+      }
+    },
+    "casual-market": {
+      "command": "uvx",
+      "args": ["casual-market-mcp"]
+    },
+    "fugle-marketdata": {
+      "command": "uvx",
+      "args": ["fugle-marketdata-mcp-server"],
+      "env": {
+        "FUGLE_API_KEY": "${FUGLE_API_KEY}"
+      }
+    },
+    "tradingview": {
+      "command": "uvx",
+      "args": ["tradingview-mcp-server"]
+    }
+  }
+}