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>

docs/agents_rule_extraction_map_v1.yaml

@@ -0,0 +1,35 @@
+meta:
+  source: AGENTS.md
+  version: 1
+  purpose: Extract top-level rules into canonical spec targets without changing AGENTS.md.
+
+principles:
+  - rule_key: no_llm_numeric_generation
+    target_spec_path: spec/00_execution_contract.yaml
+  - rule_key: single_formula_registry_source
+    target_spec_path: spec/13_formula_registry.yaml
+  - rule_key: runtime_temp_direct_read_block
+    target_spec_path: spec/32_canonical_artifact_resolver.yaml
+  - rule_key: replay_live_separation
+    target_spec_path: spec/37_evaluation_dashboard_contract.yaml
+  - rule_key: live_t20_promotion_lock
+    target_spec_path: spec/35_rule_lifecycle_governance_v3.yaml
+  - rule_key: validation_failure_no_bypass
+    target_spec_path: spec/21_harness_governance_contract.yaml
+  - rule_key: data_missing_only
+    target_spec_path: spec/07_output_schema.yaml
+  - rule_key: gas_thin_adapter
+    target_spec_path: spec/34_architecture_boundaries.yaml
+  - rule_key: prompt_numeric_freeze
+    target_spec_path: spec/31_low_capability_llm_response_contract.yaml
+  - rule_key: single_execution_authority
+    target_spec_path: spec/33_execution_precedence_lock.yaml
+  - rule_key: hts_order_executable_only_after_gate
+    target_spec_path: spec/19_harness_contract.yaml
+  - rule_key: no_intraday_aggressive_buy_before_close
+    target_spec_path: spec/06_exit_policy.yaml
+
+mapping_policy:
+  - "The original AGENTS.md is not edited by this proposal."
+  - "Each extracted rule must have a target_spec_path."
+  - "The principles list is intentionally capped at 12."