修复测试模型路径并完善四路八路回归与文档

- 按文件哈希区分当前八路工程和历史 Amesim 基准，修复测试与清单中的旧路径。
- 四路审计从 JSON 按需生成 XML，八路新增只核对模式，并显式使用 UTF-8 与 LF。
- 将缺失高刚度夹具的测试替换为当前八路完整 BDF 运行，明确未恢复原 RK45 专项覆盖。
- 更新前端大型工程测试、历史活动回放入口、数据说明、现行规范和相关报告。

验证：全量后台 374 项通过、1 项条件跳过；前端 11 项通过、历史独立服务用例 1 项跳过；四路八路 AME 审计通过。
环境、缓存和运行产物保持忽略；本次未实施工程 JSON 字段精简。

frontend/tests/e2e/fit-view.spec.ts

@@ -23,7 +23,7 @@ type ImportedProject = {
 };
 
 const MQL_8_PROJECT_PATH = fileURLToPath(
-  new URL("../../../tests/fixtures/legacy/test-mql-8.json", import.meta.url),
+  new URL("../../../tests/data/test-mql-8-corrected.json", import.meta.url),
 );
 const mql8Project = JSON.parse(
   readFileSync(MQL_8_PROJECT_PATH, "utf8"),
@@ -337,7 +337,7 @@ test("加载本地工程后自动适配建模画布", async ({ page }) => {
     exact: true,
   });
   await expect(consolePanel.locator(".simulation-console-dock-summary")).toContainText(
-    "工程已加载",
+    "已按旧工程规则读取参数",
   );
   await expect(consolePanel.locator(".simulation-console-dock-log")).toHaveCount(0);
   await page.getByRole("button", { name: "展开仿真控制台" }).click();
@@ -480,7 +480,7 @@ test("恢复自动保存工程后自动适配建模画布", async ({ page }) =>
     exact: true,
   });
   await expect(consolePanel.locator(".simulation-console-dock-summary")).toContainText(
-    "已恢复上次自动保存的工程",
+    "已按旧工程规则读取参数",
   );
   await expect(consolePanel.locator(".simulation-console-dock-log")).toHaveCount(0);
   await page.getByRole("button", { name: "展开仿真控制台" }).click();
@@ -687,9 +687,11 @@ test("结果页系统图为真实大型工程的非连接交叉线显示线桥",
   await expect(
     page.locator(".results-system-canvas .react-flow__node"),
   ).toHaveCount(mql8Project.nodes.length);
+  // In the AME-corrected layout P4 #5 crosses the non-connected vertical line.
+  // P4 #1 used by the old fixture no longer has that crossing after rotation.
   await expect(
     page.locator(
-      '.results-system-canvas .react-flow__edge[data-id="edge-amesim_p4node2_1-port_2-amesim_pnl0001_13-port_2-1786972847258"] .react-flow__edge-path',
+      '.results-system-canvas .react-flow__edge[data-id="edge-amesim_p4node2_5-port_3-amesim_pnl0001_17-port_2-1786949374542"] .react-flow__edge-path',
     ),
   ).toHaveAttribute("d", / Q /);
 });

frontend/tests/e2e/simulation-live-mql8.spec.ts

@@ -1,6 +1,7 @@
 import { expect, test, type Page } from "@playwright/test";
 import { createHash } from "node:crypto";
-import { readFileSync, statSync, writeFileSync } from "node:fs";
+import { mkdirSync, readFileSync, statSync, writeFileSync } from "node:fs";
+import { dirname } from "node:path";
 import { fileURLToPath } from "node:url";
 
 type CompactProgressEvent = {
@@ -42,12 +43,14 @@ type BrowserStreamEvidence = {
   parseErrors: string[];
 };
 
+// Historical Python activity replay, opt-in only. Current native acceptance uses
+// tests/manual/browser_native_simulation.mjs with the corrected eight-branch JSON.
 const PROJECT_PATH = fileURLToPath(
-  new URL("../../../tests/fixtures/legacy/test-mql-8.json", import.meta.url),
+  new URL("../../../tests/baselines/simulation/test_mql_8/sources/test-mql-8.json", import.meta.url),
 );
 const EVIDENCE_PATH = fileURLToPath(
   new URL(
-    "../../../tests/baselines/simulation/test_mql_8/runs/2026-08-18-production-browser-live-activity-v1-0.2.json",
+    "../../../test/live-browser-mql8/latest-evidence.json",
     import.meta.url,
   ),
 );
@@ -206,6 +209,11 @@ function retainMoreCompleteEvidence(
   return retained;
 }
 
+test.skip(
+  ({ baseURL }) => baseURL !== "http://127.0.0.1:14173",
+  "Historical activity replay requires --config playwright.live.config.ts and its separate backend; current native acceptance has a separate entry.",
+);
+
 test("test-mql-8 在真实浏览器流式链路完成 0.2 s BDF 仿真", async ({
   page,
 }, testInfo) => {
@@ -514,7 +522,7 @@ test("test-mql-8 在真实浏览器流式链路完成 0.2 s BDF 仿真", async (
         servingMode: "isolated-vite-dev-proxy",
       },
       source: {
-        path: "tests/fixtures/legacy/test-mql-8.json",
+        path: "tests/baselines/simulation/test_mql_8/sources/test-mql-8.json",
         bytes: statSync(PROJECT_PATH).size,
         sha256: createHash("sha256").update(projectBytes).digest("hex"),
       },
@@ -562,6 +570,7 @@ test("test-mql-8 在真实浏览器流式链路完成 0.2 s BDF 仿真", async (
       },
     };
     const serializedEvidence = `${JSON.stringify(evidence, null, 2)}\n`;
+    mkdirSync(dirname(EVIDENCE_PATH), { recursive: true });
     writeFileSync(EVIDENCE_PATH, serializedEvidence, "utf8");
     await testInfo.attach("mql8-live-browser-evidence", {
       body: Buffer.from(serializedEvidence),