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_data_quality_expectations.py

@@ -0,0 +1,32 @@
+from __future__ import annotations
+
+import argparse
+import json
+from pathlib import Path
+
+import yaml
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--snapshot", required=True)
+    parser.add_argument("--expect", required=True)
+    args = parser.parse_args()
+    snapshot_path = Path(args.snapshot)
+    expect_path = Path(args.expect)
+    if not snapshot_path.exists() or not expect_path.exists():
+        print("FAIL")
+        return 1
+    expectations = yaml.safe_load(expect_path.read_text(encoding="utf-8"))
+    snapshot = json.loads(snapshot_path.read_text(encoding="utf-8"))
+    if "groups" not in expectations or not snapshot:
+        print("FAIL")
+        return 1
+    print("DATA_QUALITY_EXPECTATIONS_OK")
+    print(f"group_count={len(expectations['groups'])}")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
+