test: align phase five dev acceptance flows

scripts/admin-test-env-modules/phase4-carrier-nodes-contract.test.mjs

@@ -80,6 +80,11 @@ test('module exposes no scheduler, attempt, internal or arbitrary stop endpoint'
   }
 })
 
+test('system-created carrier histories accept operator zero while user writes still require numeric identities', () => {
+  assert.match(source, /function validOperatorId\(value\) \{ return value === '0' \|\| validNumericId\(value\) \}/)
+  assert.match(source, /item\?\.operatorId == null \|\| validOperatorId\(item\.operatorId\)/)
+})
+
 test('ownership requires current marker, long query id and outbound-confirm source', () => {
   const valid = { queryId: QUERY_ID, marker: MARKER, ownedByModule: true,
     triggerSource: 'OUTBOUND_CONFIRM' }