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_account_snapshot_contract_v1.py

@@ -0,0 +1,38 @@
+#!/usr/bin/env python3
+from __future__ import annotations
+
+import argparse
+import json
+from pathlib import Path
+
+import yaml
+
+
+ROOT = Path(__file__).resolve().parents[1]
+
+
+def main() -> int:
+    ap = argparse.ArgumentParser()
+    ap.add_argument("--spec", default="spec/15_account_snapshot_contract.yaml")
+    args = ap.parse_args()
+    data = yaml.safe_load((ROOT / args.spec).read_text(encoding="utf-8")) or {}
+    contract = data.get("account_snapshot_contract") or {}
+    required = {"holdings_screen", "cash_screen", "open_orders_screen", "contribution_limit_screen"}
+    missing_groups = sorted(required - set((contract.get("required_capture_groups") or {}).keys()))
+    canonical = contract.get("canonical_fields") or {}
+    needed = ["captured_at", "account", "account_type", "holding_quantity", "average_cost", "current_price", "market_value", "immediate_cash", "settlement_cash_d2", "available_cash", "parse_status"]
+    missing_fields = [field for field in needed if field not in canonical]
+    result = {
+        "formula_id": "ACCOUNT_SNAPSHOT_CONTRACT_V1",
+        "missing_capture_group_count": len(missing_groups),
+        "missing_field_count": len(missing_fields),
+        "gate": "PASS" if not missing_groups and not missing_fields else "FAIL",
+    }
+    out = ROOT / "Temp" / "account_snapshot_contract_v1.json"
+    out.write_text(json.dumps(result, ensure_ascii=False, indent=2), encoding="utf-8")
+    print(json.dumps(result, ensure_ascii=False, indent=2))
+    return 0 if result["gate"] == "PASS" else 1
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())