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_adr_index.py

@@ -0,0 +1,42 @@
+from __future__ import annotations
+
+import sys
+from pathlib import Path
+
+import yaml
+
+
+def main() -> int:
+    if len(sys.argv) < 3 or sys.argv[1] != "--index":
+        print("usage: validate_adr_index.py --index governance/adr_index.yaml")
+        return 2
+    index_path = Path(sys.argv[2])
+    data = yaml.safe_load(index_path.read_text(encoding="utf-8"))
+    entries = data.get("entries", [])
+    errors: list[str] = []
+    if data.get("adr_count") != len(entries):
+        errors.append("adr_count mismatch")
+    allowed = {"proposed", "accepted", "superseded", "deprecated"}
+    for entry in entries:
+        if entry.get("status") not in allowed:
+            errors.append(f"invalid status: {entry.get('adr_id')}")
+        path = Path(entry.get("path", ""))
+        if not path.exists():
+            errors.append(f"missing adr file: {path}")
+        else:
+            text = path.read_text(encoding="utf-8")
+            for required in ("## Context", "## Decision", "## Consequences", "## Rollback"):
+                if required not in text:
+                    errors.append(f"missing section {required} in {path}")
+    if errors:
+        print("FAIL")
+        for err in errors:
+            print(err)
+        return 1
+    print("ADR_INDEX_OK")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
+