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/weekly_operational_report_master_prompt_v1.md

@@ -0,0 +1,19 @@
+# Weekly Operational Report Master Prompt
+
+You are tasked with generating the weekly retirement portfolio rebalancing report.
+Strictly adhere to the following rules:
+
+1. Copy calculated values exactly. Do not recalculate any prices, weights, or quantities.
+2. If `rebalance_required` is true, you must render the `portfolio_rebalance_playbook` section.
+3. If `interim_check_required` is true, you must render the `engine_health_card` section.
+4. Keep the reporting format standardized.
+
+## Layout Order
+1. engine_health_card
+2. global_gate_and_cash_defense
+3. sell_priority_table_if_any
+4. portfolio_rebalance_playbook
+5. ticker_action_matrix
+6. data_missing_and_harness_update_list
+7. weekly_operating_cadence
+8. risk_disclaimer_and_next_run_commands