fix: retain scanned carton traceability in measurement drafts

scripts/admin-test-env-modules/phase4-cross-region-events-contract.test.mjs

@@ -90,6 +90,14 @@ test('phase-four producer variants restore the primary orchestration fixture aft
   ]) assert.match(createdKeys, new RegExp(`'${key}'`))
 })
 
+test('every cross-region producer keeps an isolated A0 occupancy for PDA snapshot invalidation', async () => {
+  const source = await import('node:fs/promises').then((fs) => fs.readFile(
+    new URL('../admin-test-env-acceptance.mjs', import.meta.url), 'utf8'))
+  const variantStart = source.indexOf('async runPhase4ProducerVariant')
+  const fixtureCall = source.slice(variantStart, source.indexOf('const loading =', variantStart))
+  assert.match(fixtureCall, /preparePhase3LoadingFixture\('', true\)/)
+})
+
 test('contract covers dual audience, canonical 403, both event directions and diagnostics', () => {
   for (const token of [
     'context.token)', 'context.overseasToken)', 'cn-overseas-event-not-delivered',