feat(EXEC-001A): add named strategy templates

app/strategies/__init__.py

@@ -1,5 +1,4 @@
 from .base import BaseStrategy, StrategyConfig
-from .engine import StrategySelectionEngine
 from .laddered_put import LadderedPutStrategy, LadderSpec
 from .lease import LeaseAnalysisSpec, LeaseStrategy
 from .protective_put import ProtectivePutSpec, ProtectivePutStrategy
@@ -15,3 +14,11 @@ __all__ = [
     "LeaseStrategy",
     "StrategySelectionEngine",
 ]
+
+
+def __getattr__(name: str):
+    if name == "StrategySelectionEngine":
+        from .engine import StrategySelectionEngine
+
+        return StrategySelectionEngine
+    raise AttributeError(f"module {__name__!r} has no attribute {name!r}")