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_strategy_harness_v2.py

@@ -0,0 +1,58 @@
+from __future__ import annotations
+
+import argparse
+import json
+from pathlib import Path
+from typing import Any
+
+
+ROOT = Path(__file__).resolve().parents[1]
+DEFAULT_PATH = ROOT / "Temp" / "strategy_harness_v2.json"
+
+
+def load_json(path: Path) -> dict[str, Any]:
+    payload = json.loads(path.read_text(encoding="utf-8"))
+    if not isinstance(payload, dict):
+        raise ValueError("payload must be object")
+    return payload
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser(description="Validate strategy harness v2 artifact")
+    parser.add_argument("--json", default=str(DEFAULT_PATH))
+    args = parser.parse_args()
+
+    path = Path(args.json)
+    if not path.is_absolute():
+        path = ROOT / path
+    payload = load_json(path)
+    errors: list[str] = []
+
+    if not str(payload.get("schema_version") or "").startswith("2026-05-22-strategy-harness-v2"):
+        errors.append("schema_version mismatch")
+    for key in (
+        "buy_anti_late_chase_harness_v2",
+        "sell_value_preserve_harness_v2",
+        "cash_raise_optimizer_harness_v2",
+    ):
+        rows = payload.get(key)
+        if not isinstance(rows, list):
+            errors.append(f"{key} must be list")
+            continue
+        for i, row in enumerate(rows):
+            if not isinstance(row, dict):
+                errors.append(f"{key}[{i}] must be object")
+                continue
+            if not str(row.get("ticker") or "").strip():
+                errors.append(f"{key}[{i}].ticker missing")
+
+    if errors:
+        print("STRATEGY_HARNESS_V2_INVALID")
+        print(json.dumps({"errors": errors}, ensure_ascii=False, indent=2))
+        return 1
+    print("STRATEGY_HARNESS_V2_OK")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())