Migrate CLI E2E tests to Node.js 26

Run the CLI subprocess suites and benchmark tools as native TypeScript with
node:test, and move them under test/e2e-cli.

Update CI and Compose runners, run local smoke tests on Linux, macOS, and
Windows, and collect source-mapped CLI coverage with c8.

test/e2e-cli/run-coverage.ts

@@ -0,0 +1,61 @@
+import { createRequire } from "node:module";
+import { dirname, join } from "node:path";
+import { fileURLToPath } from "node:url";
+import { spawnProcess } from "./helpers/process.ts";
+import { CLI_DIR, REPOSITORY_ROOT } from "./helpers/paths.ts";
+
+const require = createRequire(import.meta.url);
+const reportDirectory = join(REPOSITORY_ROOT, "coverage", "cli-e2e");
+const task = process.argv[2] ?? "test:local";
+
+async function run(args: string[], cwd: string, env: NodeJS.ProcessEnv = {}): Promise<void> {
+    const result = await spawnProcess(process.execPath, {
+        args,
+        cwd,
+        env,
+        stdin: "inherit",
+        stdout: "inherit",
+        stderr: "inherit",
+    }).status;
+    if (!result.success) throw new Error(`Coverage command failed with exit code ${result.code}`);
+}
+
+if (task === "test:p2p:compose" || task === "test:e2e:all") {
+    throw new Error("CLI coverage collects host processes; select a host-direct task such as test:local or test:ci");
+}
+const viteCli = join(dirname(require.resolve("vite/package.json")), "bin", "vite.js");
+await run([viteCli, "build"], CLI_DIR, { LIVESYNC_CLI_COVERAGE: "1" });
+const c8Cli = require.resolve("c8/bin/c8.js");
+await run(
+    [
+        c8Cli,
+        "--all",
+        "--src=src/apps/cli",
+        // Match native paths and Node's file URL source-map cache.
+        "--include=**/src/**/*.ts",
+        "--exclude-after-remap",
+        "--exclude=**/test-support/**",
+        "--exclude=**/test/**",
+        "--exclude=**/*.unit.spec.ts",
+        "--exclude=**/*.test.ts",
+        "--reporter=text",
+        "--reporter=json",
+        "--reporter=html",
+        `--reports-dir=${reportDirectory}`,
+        `--temp-directory=${join(reportDirectory, "raw")}`,
+        process.execPath,
+        fileURLToPath(new URL("./run-task.ts", import.meta.url)),
+        task,
+        ...process.argv.slice(3),
+    ],
+    REPOSITORY_ROOT
+);
+await run(
+    ["--test", "--test-concurrency=1", fileURLToPath(new URL("./coverage-report.test.ts", import.meta.url))],
+    REPOSITORY_ROOT,
+    {
+        LIVESYNC_CLI_COVERAGE_REPORT: join(reportDirectory, "coverage-final.json"),
+        LIVESYNC_CLI_COVERAGE_TASK: task,
+    }
+);
+console.log(`CLI E2E coverage: ${reportDirectory}`);