fix: remove false integration test claim in MPR008 test comment

Author: retran

mdl/linter/rules/mpr008_overlapping_activities_test.go

@@ -37,8 +37,9 @@ func TestOverlappingActivitiesRule_Metadata(t *testing.T) {
 }
 
 // NOTE: The full Check() logic for overlapping activities requires ctx.Reader().GetMicroflow()
-// which needs a real *mpr.Reader. The overlap detection algorithm is tested via integration
-// tests. Here we verify constants used for overlap threshold.
+// which needs a real *mpr.Reader. This rule currently lacks end-to-end coverage;
+// behavioral testing requires a real .mpr project. Here we verify constants used for
+// overlap threshold.
 
 func TestOverlappingActivities_Constants(t *testing.T) {
 	if activityBoxWidth != 120 {