fix: order Local G2 regions back to front

ClumsyPilot/tests/verify_path_smoothing_local_g2_candidates.ps1

@@ -74,6 +74,20 @@ $gearBoundary = Invoke-Scenario 'GearBoundary'
 Assert-True $gearBoundary.GearBoundaryMarkerPreserved `
     'A window touching a gear-switch segment boundary must preserve its point-level gear marker.'
 
+$twoRegions = Invoke-Scenario 'TwoRegionWorkOrder'
+Assert-True $twoRegions.WorkOrderDescending `
+    'Same-segment regions must be processed from larger original local arc to smaller local arc.'
+Assert-True $twoRegions.FrontArcPreservedAfterBackReplacement `
+    'Replacing the back region must preserve the front region original arc coordinates.'
+Assert-True $twoRegions.BothReplacementsRetained `
+    'Back-then-front replacement must retain both length-changing local replacements.'
+Assert-True $twoRegions.ForwardOrderRejected `
+    'The regression fixture must prove that front-first invalidates the original back absolute arc.'
+Assert-True $twoRegions.DeterministicWorkOrder `
+    'Work ordering must repeat exactly without mutating report order.'
+Assert-True $twoRegions.InvalidWorkOrderRejected `
+    'Work ordering must reject null regions and cross-segment event contents.'
+
 $evaluatorType = Get-RequiredType 'MultiWheelC.TrajectoryPlanning.PathSmoothing.LocalG2.LocalG2CandidateEvaluator'
 $evaluatorHooksType = $evaluatorType.GetNestedType('TestHooks', [Reflection.BindingFlags]'Public,NonPublic')
 Assert-True ($null -ne $evaluatorHooksType) 'LocalG2CandidateEvaluator must expose narrowly scoped deterministic TestHooks.'