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>

spec/release/low_capability_context_aliases.yaml

@@ -0,0 +1,10 @@
+schema_version: low_capability_context_aliases.v1
+aliases:
+  final_context_v5:
+    path: Temp/final_context_for_llm_v5.yaml
+    compatibility: ["v4", "v5"]
+    status: active
+  final_context_v4:
+    path: Temp/final_context_for_llm_v5.yaml
+    compatibility: ["v4"]
+    status: deprecated_alias_to_v5

spec/release/release_train.yaml

@@ -0,0 +1,9 @@
+schema_version: release_train.v1
+stages:
+  - dev
+  - shadow
+  - limited
+  - release
+rollback_manifest_required: true
+full_gate_required_for_release: true
+

spec/release/repository_entropy_budget.yaml

@@ -0,0 +1,8 @@
+schema_version: repository_entropy_budget.v1
+max_total_files: 2000
+max_package_scripts: 220
+max_temp_json_files: 500
+max_docs_lines: 120000
+release_budget_notes:
+  - archive stale Temp JSONs when safe
+  - keep package scripts within release envelope

spec/release/version_retirement_policy.yaml

@@ -0,0 +1,11 @@
+schema_version: version_retirement_policy.v1
+policy:
+  max_active_versions: 1
+  max_shadow_versions: 1
+  auto_archive_threshold: 3
+  retention_period_days: 30
+  exceptions:
+    - pattern: "runtime/python/core/formulas/generated/*"
+      reason: "Codegen parity requires historical versions for backtest consistency"
+    - pattern: "artifacts/archive/*"
+      reason: "Explicit archive directory"