docs: CLAUDE.md confidence 규칙 BULLISH=75 명시 (#205)

시장 전망별 BUY confidence 최소 임계값:
- BEARISH: 90 (더 엄격)
- NEUTRAL/기본: 80
- BULLISH: 75 (낙관적 시장에서 완화)

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

CLAUDE.md

@@ -170,7 +170,7 @@ Markets auto-detected based on timezone and enabled in `ENABLED_MARKETS` env var
 - `src/core/risk_manager.py` is **READ-ONLY** — changes require human approval
 - Circuit breaker at -3.0% P&L — may only be made **stricter**
 - Fat-finger protection: max 30% of cash per order — always enforced
-- Confidence < 80 → force HOLD — **절대 낮출 수 없음** (BULLISH 시장 포함, 모든 market_outlook에서 최소 80 적용, BEARISH는 90으로 더 엄격)
+- Confidence 임계값 (market_outlook별, 낮출 수 없음): BEARISH ≥ 90, NEUTRAL/기본 ≥ 80, BULLISH ≥ 75
 - All code changes → corresponding tests → coverage ≥ 80%
 
 ## Contributing