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_formula_registry.py

@@ -0,0 +1,28 @@
+from __future__ import annotations
+
+import argparse
+from pathlib import Path
+
+import yaml
+
+
+ROOT = Path(__file__).resolve().parents[1]
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--strict", action="store_true")
+    args = parser.parse_args()
+    manifest = yaml.safe_load((ROOT / "spec" / "formulas" / "manifest.yaml").read_text(encoding="utf-8"))
+    normalized = yaml.safe_load((ROOT / "spec" / "03_formulas" / "formula_registry.normalized.yaml").read_text(encoding="utf-8"))
+    domain_files = manifest.get("domains") or {}
+    formulas = normalized.get("formulas") or []
+    ok = bool(domain_files) and len(formulas) > 0
+    print("FORMULA_REGISTRY_OK" if ok else "FORMULA_REGISTRY_FAIL")
+    print(f"domain_count={len(domain_files)} formula_count={len(formulas)}")
+    return 0 if ok or not args.strict else 1
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
+