fix: routing_gate 실측 PASS 확인 + spec/30 보정 + DAG step_count 68 갱신

- spec/30: routing_gate FAIL→PASS (2026-06-14 실측: SHORT=12.5% MID=50.0% LONG=37.5%)
  pass/fail 카운트 9/8→10/7 (58.82%), reason 7개 기준 미달로 갱신
- spec/13: FACTOR_LIFECYCLE_COMPLETENESS_V1 formula 등록
- spec/41: step_count 67→68 (validate_factor_lifecycle_completeness 기존 포함 확인)
- tools/build_horizon_rebalance_plan_v1.py: docstring 갱신 (MID/LONG 상한 명시)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

spec/13_formula_registry.yaml

@@ -89,6 +89,7 @@ formula_registry:
       - CANONICAL_ARTIFACT_RESOLVER_V1
       - COMPLETION_GAP_V1
       - DATA_GATED_PROGRESS_V1
+      - FACTOR_LIFECYCLE_COMPLETENESS_V1
       - FACTOR_SHADOW_ELIGIBILITY_V1
       - FINAL_EXECUTION_DECISION_V2
       - FORMULA_REGISTRY_SYNC_V1
@@ -111,6 +112,7 @@ formula_registry:
         CANONICAL_ARTIFACT_RESOLVER_V1: tools/validate_canonical_artifact_resolver_v1.py
         COMPLETION_GAP_V1: tools/build_completion_gap_v1.py
         DATA_GATED_PROGRESS_V1: tools/build_data_gated_progress_v1.py
+        FACTOR_LIFECYCLE_COMPLETENESS_V1: tools/validate_factor_lifecycle_completeness_v1.py
         FACTOR_SHADOW_ELIGIBILITY_V1: tools/build_factor_shadow_eligibility_v1.py
         FINAL_EXECUTION_DECISION_V2: tools/build_final_execution_decision_v2.py
         FORMULA_REGISTRY_SYNC_V1: tools/build_formula_registry_sync_v1.py