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>

runtime/active_artifact_manifest.yaml

@@ -0,0 +1,44 @@
+formula_id: ACTIVE_ARTIFACT_MANIFEST_V2
+generated_at: '2026-06-07T09:32:23.434604+00:00'
+is_active: true
+supersedes: ACTIVE_ARTIFACT_MANIFEST_V1
+superseded_by: null
+input_hash: 296103ac8bf8e1e570838d0a58ec91630cda687b58a59550e80db7b8fb98e28d
+source_snapshot_hash: 755d17e5bd5211108f9ac872ca42b622d2e1c1bcb7b97219f335b465f0fc8113
+active_count_per_formula: 1
+legacy_reference_render_blocked_count: 0
+report_active_artifact_match_pct: 100.0
+authority_collision_count: 0
+stale_artifact_count: 0
+canonical_source: Temp/final_decision_packet_active.json
+active_aliases:
+  final_decision_packet_active: Temp/final_decision_packet_active.json
+source_precedence:
+- final_decision_packet_active
+- final_execution_decision_v2
+- smart_cash_recovery_v7
+- smart_cash_recovery_v6
+- smart_cash_recovery_v5
+- engine_audit_v1
+- sell_engine_audit_v1
+report_authority_diff_count: 0
+single_truth_conflict_count: 0
+manifest_rows:
+- formula_id: cash_shortfall_min_krw
+  active_artifact: Temp/final_decision_packet_active.json
+  value: 36092555.0
+- formula_id: final_execution_gate
+  active_artifact: Temp/final_execution_decision_v2.json
+  value: AUDIT_ONLY
+- formula_id: prediction_match_rate_pct
+  active_artifact: Temp/prediction_accuracy_harness_v2.json
+  value: 54.76
+- formula_id: single_truth_ledger
+  active_artifact: Temp/single_truth_ledger_v2.json
+  value: Temp/final_decision_packet_active.json
+- formula_id: canonical_artifact_resolver
+  active_artifact: Temp/canonical_artifact_resolver_v1.json
+  value: Temp/smart_cash_recovery_v7.json
+- formula_id: smart_cash_recovery_v7
+  active_artifact: Temp/smart_cash_recovery_v9.json
+  value: 57841575