feat(skill-learning): select replay eval cases

app-instance/backend/beaver/skills/learning/__init__.py

@@ -1,5 +1,6 @@
 """Skill learning loop helpers."""
 
+from .case_selection import select_replay_cases
 from .evidence import EvidencePacket, EvidenceSelector
 from .eval import SkillDraftEvaluator
 from .missing_skill import (
@@ -15,6 +16,7 @@ from .synthesizer import SkillDraftSynthesizer
 from .worker import SkillLearningWorker, SkillLearningWorkerConfig, SkillLearningWorkerResult
 
 __all__ = [
+    "select_replay_cases",
     "EvidencePacket",
     "EvidenceSelector",
     "SkillDraftEvaluator",