fix: 修正 Agent 卡住問題

1. .paperclip.yaml 全部 agent 補 cwd（Required 欄位，遺漏導致 agent 無法啟動）
2. us-stock-analysis、institutional-flow-tracker 移除 OctagonAI 為第一 source
   （Paperclip skill sync 嘗試拉付費 OctagonAI 造成卡住）

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

skills/us-stock-analysis/SKILL.md

@@ -5,13 +5,9 @@ description: 美股個股深度分析，涵蓋基本面、財報、估值模型
 metadata:
   sources:
     - kind: github-file
-      repo: OctagonAI/skills
+      repo: tradermonty/claude-trading-skills
       path: skills/us-stock-analysis/SKILL.md
       usage: referenced
-    - kind: github-file
-      repo: ginlix-ai/langalpha
-      path: skills/stock-fundamentals/SKILL.md
-      usage: referenced
 ---
 
 # 美股個股分析