WBS-7.3: GAS→Python 마이그레이션 5개 항목 완료 (F14, F02-F06)

- F14: late_chase_risk_score 검증
  * GAS가 유일한 생산처 (Python canonical 없음)
  * migration_action: KEEP_IN_GAS로 정정, status: DONE

- F02/F03/F04/F06: priceBasis 로직 포팅
  * formulas/price_basis_v1.py: select_price_basis_tier2/tier1 구현
  * tests/parity/test_price_basis_parity_v1.py: 8 parity 테스트 (모두 PASS)
  * GAS Number.isFinite() 의미론 정확히 재현 (math.isfinite 사용)
  * 모든 테스트 112/112 PASS

남은 작업 (4개):
- F05: decision_logic (action assignment)
- F07: score_logic (threshold addition)
- F10: routing decision
- F15: late_chase_gate

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

tools/validate_execution_precedence_lock_v2.py

@@ -13,6 +13,12 @@ from v7_hardening_common import ROOT, TEMP, load_json, save_json
 DEFAULT_OUT = TEMP / "execution_precedence_lock_v2.json"
 
 
+import sys
+
+if sys.stdout.encoding and sys.stdout.encoding.lower() not in ("utf-8", "utf8"):
+    sys.stdout = open(sys.stdout.fileno(), mode="w", encoding="utf-8", buffering=1)
+
+
 def main() -> int:
     v4 = load_json(TEMP / "final_execution_decision_v4.json")
     scr = (