refactor: share INFRA stop-reason set from core.evolution

core/evolution/__init__.py

@@ -4,7 +4,7 @@
 只依赖 Protocol 接口和标准库，可搬到无 adapters 的环境用假实现原样运行。
 """
 
-from core.evolution.diagnose import run_diagnosis
+from core.evolution.diagnose import INFRA_STOP_REASONS, run_diagnosis
 from core.evolution.evolve import (
     edit_budget_at,
     evolve_single_skill,
@@ -44,6 +44,7 @@ from core.evolution.types import (
 from core.evolution.validate import classify_quadrants, compute_accuracy, pair_block
 
 __all__ = [
+    "INFRA_STOP_REASONS",
     "CaseSample",
     "DiagnosePrompts",
     "DiagnosisResult",