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_rule_lifecycle.py

@@ -0,0 +1,23 @@
+#!/usr/bin/env python3
+from __future__ import annotations
+
+import argparse
+from pathlib import Path
+
+import yaml
+
+
+def main() -> int:
+    ap = argparse.ArgumentParser()
+    ap.add_argument("--strict", action="store_true")
+    ap.add_argument("--path", default="governance/rule_lifecycle.yaml")
+    args = ap.parse_args()
+    data = yaml.safe_load(Path(args.path).read_text(encoding="utf-8"))
+    ok = data.get("legacy_reference_blocked") is True and "active" in (data.get("statuses") or [])
+    print("RULE_LIFECYCLE_POLICY_OK" if ok else "RULE_LIFECYCLE_POLICY_FAIL")
+    print(yaml.safe_dump(data, sort_keys=False, allow_unicode=True).strip())
+    return 0 if ok or not args.strict else 1
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())