refactor(operator-trend): tighten decision_memory_map type to dict[str, dict]

Match the original god-function's annotation (review nit): _decision_memory_map
returns dict[str, dict] and _resolution_targets takes it as dict[str, dict]; the
extracted helper should not widen it to dict[str, Any].

Author: saagpatel

src/operator_trend_resolution_payload.py

@@ -22,7 +22,7 @@ def build_resolution_trend_payload(
     *,
     apply_chain: dict[str, Any],
     summary_context: dict[str, Any],
-    decision_memory_map: dict[str, Any],
+    decision_memory_map: dict[str, dict],
     class_transition_health_summary: Callable[..., Any],
     class_transition_resolution_summary: Callable[..., Any],
     closure_forecast_hysteresis_summary: Callable[..., Any],