Sprint 241 Plan: Impact-by-Impact Native Decomposition Coverage Gates

Goal

Enumerate all major shallow-decomposition impact surfaces and enforce profile-specific native coverage checks for each.

Step 2248: Create complete dated impact list for shallow decomposition effects.
Step 2249: Define one-by-one impact profiles with trigger + required coverage constraints.
Step 2250: Implement native impact coverage checker over run artifacts.
Step 2251: Add standalone gate wrapper and aggregate analyzer.
Step 2252: Integrate optional impact coverage gate into sprint pipeline.
Step 2253: Add Sprint241IntegrationSummary.h and execution tracker.