fix(acceptance): enforce immutable confirmed fees

scripts/admin-test-env-modules/phase3-order-splitting-contract.test.mjs

@@ -106,6 +106,14 @@ test('booking freezes the source customer channel and warehouse scope', () => {
   assert.match(source, /containerType: '40HC', capacityCbm: 76, maxWeightKg: 28000/)
 })
 
+test('split chain starts from the partial inbound and derives quantities from the real tree', () => {
+  assert.match(source, /fixture\?\.incrementalInboundId \|\| fixture\?\.inboundId/)
+  assert.match(source, /const originalPackageCount = Number\(firstTree\?\.originalPackageCount\)/)
+  assert.match(source, /while \(activeRemainders\(tree\)\.length > 0\)/)
+  assert.match(source, /sourcePackageCount = Number\(source\?\.packageCount\)/)
+  assert.doesNotMatch(source, /snapshotMatches\(firstTree, 4, 1, 3, 1\)/)
+})
+
 test('booking fixture never invents supplier names without formal IDs', () => {
   assert.match(source, /oceanBookingDraft/)
   assert.doesNotMatch(source, /SPLIT-SHIPPING|SPLIT-AGENT/)