完善借款、编号、付款与预算并发及验收（09-06-release-gate-integrity）

汇总已落盘的借款本金与还款、兼容历史编号的周期化编号、付款责任与回单核验、报销进度和排序、PWA/采购事务、错误原因与日期校验及ERP退役。
统一共享预算池锁序和锁后判断，恢复差旅原预算选择，补原因码固定夹具及反向完整性检查。
纳入配套迁移、测试、受管QA、分层验收合同、规约及任务记录；原始证据留在ignored artifacts。

关联任务：09-17-company-loan-principal-repayment、09-17-erp-exclusive-retirement、09-18-reimbursement-periodic-numbering、09-08-reimbursement-payment-closeout、09-18-local-concurrency-product-fixes、09-19-budget-pool-concurrency、09-05-error-explainability-payment-readiness。
预算补审由Claude定向验证2文件928项通过，原4446/28及r6结果仍仅对应各自历史输入；本轮未重跑测试。
完整新候选门禁、R1真实入口接入与12项公网义务仍开放。生产编号未启用、差旅仍冻结；不推送、不部署，不宣称发布资格。

.trellis/tasks/09-18-local-concurrency-product-fixes/task.json

@@ -0,0 +1,58 @@
+{
+  "id": "local-concurrency-product-fixes",
+  "name": "local-concurrency-product-fixes",
+  "title": "PWA 更新事件与采购创建事务最小修复",
+  "description": "PWA原生控制器更新与采购最小写事务已本地实施；131单测、原四文件并发4/4、认证/OCR18/18通过。独立及完整门禁仍待，不提交发布。",
+  "status": "in_progress",
+  "dev_type": null,
+  "scope": "client PWA lifecycle and server purchase draft transaction",
+  "package": null,
+  "priority": "P1",
+  "creator": "shunli",
+  "assignee": "shunli",
+  "createdAt": "2026-09-18",
+  "completedAt": null,
+  "branch": null,
+  "base_branch": "main",
+  "worktree_path": null,
+  "commit": null,
+  "pr_url": null,
+  "subtasks": [],
+  "children": [],
+  "parent": null,
+  "relatedFiles": [
+    "client/src/pwa.ts",
+    "client/vite.config.ts",
+    "server/src/routes/purchaseRequests.js",
+    "server/tests/unit/utils/client-pwa-lifecycle.test.js",
+    "server/tests/unit/routes/purchase-request.errors.test.js",
+    "client/tests/e2e/pwa-cross-version-upgrade.spec.ts"
+  ],
+  "notes": "2026-09-19 g20-full-r6：4437后端通过/1原跳过，372本地浏览器全过；PARTIAL仅dirty_candidate，独立PENDING/无部署，旧registry保护例外保留且无新增漂移。当前余额见implement顶部。\n2026-09-18本地验证完成，失败/诊断/修后回执与候选在local-coverage-g18-20260918。主会话自检不代替独立PENDING；无预算/并发/权限/审计弱化，未发布。\n",
+  "meta": {
+    "localImplementation": "VERIFIED",
+    "independentReview": "PARTIAL_WITH_LEGACY_BUDGET_FINDING",
+    "normalReleaseEligible": false,
+    "latestLocalCandidate": {
+      "run": "g20-full-r6",
+      "localChecksPassed": true,
+      "receiptStatus": "PARTIAL",
+      "browserPassed": 372,
+      "publicPending": 12,
+      "independentReview": "PARTIAL_WITH_LEGACY_BUDGET_FINDING",
+      "deploymentEligible": false,
+      "legacyProtectionStatus": "FAIL_ONE_KNOWN_DERIVED_REGISTRY",
+      "newProtectedDrift": false,
+      "productionNumberingActivated": false
+    },
+    "p9TargetedReview20260919": {
+      "status": "PASS_SCOPED",
+      "report": "artifacts/qa-governance/business-followup-claude-review-20260919T023537Z.txt",
+      "reportSha256": "b48e5f53340e139e5a97b5fdcb6d7003881a80a8a08d4004d01aaa6a759d2d0b",
+      "runtimeTestsRerun": false,
+      "budgetPoolFinding": "LEGACY_CONFIRMED_STATIC_UNFIXED",
+      "remediationTask": ".trellis/tasks/09-19-budget-pool-concurrency",
+      "evidence": "artifacts/qa-governance/business-followup-reception-20260919"
+    }
+  }
+}