feat: 리밸런싱 엔진 V1 + GAS 버그 수정 (2026-06-13)

주요 변경:
- tools/build_rebalance_engine_v1.py: REBALANCE_ENGINE_V1 신규
  * account_snapshot 직접 합산(_build_snap_position_map) → 소수주 분리 행 병합
  * 레짐 소스 macro.REGIME_PRELIM 최우선 (GAS 와 동일)
- src/gas_adapter_parts/gdf_06_rebalance.gs: runRebalanceSheet_() 신규
  * Logger.log / getSpreadsheet_() 로 run_all 연동 수정
- src/gas_adapter_parts/gdc_01_fetch_fundamentals.gs
  * _mergePositionRecord_(): 소수주 중복 행 합산 신규
  * parseInt → parseFloat (qty, availQty)
- src/gas_adapter_parts/gdf_01_price_metrics.gs
  * 미보유 종목 SELL_READY → WATCH_EXIT_SIGNAL
- spec/41_release_dag.yaml: build_rebalance_sheet 노드 추가 (step_count 63)
- spec/51_formula_lifecycle_registry.yaml: REBALANCE_ENGINE_V1 등록

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

tools/validate_module_io_coverage_v1.py

@@ -0,0 +1,31 @@
+#!/usr/bin/env python3
+import json
+import argparse
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[1]
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--json", default="Temp/module_io_coverage_v1.json")
+    args = parser.parse_args()
+    
+    path = ROOT / args.json
+    if not path.exists():
+        print(f"Coverage file not found: {path}")
+        return 1
+        
+    data = json.loads(path.read_text(encoding="utf-8"))
+    coverage = data.get("coverage_pct", 0)
+    
+    print(f"MODULE IO COVERAGE: {coverage:.1f}%")
+    if coverage < 100:
+        missing = [m["id"] for m in data.get("module_details", []) if not m["covered"]]
+        print(f"Missing modules: {', '.join(missing)}")
+        return 1
+    
+    print("PASS: Module IO schema coverage is 100%")
+    return 0
+
+if __name__ == "__main__":
+    main()