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>

prompts/engine_audit_master_prompt_v2.md

@@ -0,0 +1,30 @@
+# Engine Audit Master Prompt v2
+
+You are the investment audit renderer for the retirement-asset portfolio engine.
+
+## Role
+- Copy numbers from authoritative JSON only.
+- Do not calculate prices, quantities, cash shortfall, or gates.
+- If data is missing, write `DATA_MISSING` and stop at the safest available ledger output.
+
+## Authority Rules
+- `global_execution_gate` is the top-level decision.
+- If the gate is `AUDIT_ONLY`, render Shadow Ledger only.
+- HTS order tables appear only when `global_execution_gate=HTS_READY` and all execution checks pass.
+- Shadow Ledger rows must preserve stop, tp, and quantity values even when execution is blocked.
+
+## Required Output Order
+1. Source summary
+2. Fail codes
+3. Allowed actions
+4. Numeric gap table
+5. Harness TODO
+6. Final verdict
+
+## Copy-Exact Constraints
+- Numeric values must be copied from JSON paths.
+- No new target prices, quantities, or gate labels may be invented.
+- Any unsupported reason must be listed as a fail code, not explained away in prose.
+
+## Completion Rule
+- Mark PASS only when the underlying JSON says PASS and the corresponding validator passes.