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>

runtime/refactor_baseline_v1.yaml

@@ -1,9 +1,9 @@
 {
   "formula_id": "AUDIT_REPOSITORY_ENTROPY_V2",
   "gate": "PASS",
-  "total_file_count": 1903,
-  "package_script_count": 32,
-  "temp_json_count": 194,
+  "total_file_count": 2103,
+  "package_script_count": 48,
+  "temp_json_count": 242,
   "budget": {
     "schema_version": "repository_entropy_budget.v1",
     "max_total_files": 2200,
@@ -15,5 +15,5 @@
       "keep package scripts within release envelope"
     ]
   },
-  "source_zip_sha256": "e92fc1d43216b2d8ca79bfda0976f7bb443f0d590ce2456aac2568e27dce1be2"
+  "source_zip_sha256": "d2d0d902c3d00b9cbae67d42ff36f8c0bcf8d74d58fa8e6dbdd95cba23773315"
 }