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/test-e2e-two-vaults-matrix.ts

@@ -0,0 +1,21 @@
+import { test } from "node:test";
+import { runScenario } from "./test-e2e-two-vaults-couchdb.ts";
+
+type MatrixCase = {
+    remoteType: "COUCHDB" | "MINIO";
+    encrypt: boolean;
+    label: string;
+};
+
+const matrixCases: MatrixCase[] = [
+    { remoteType: "COUCHDB", encrypt: false, label: "COUCHDB-enc0" },
+    { remoteType: "COUCHDB", encrypt: true, label: "COUCHDB-enc1" },
+    { remoteType: "MINIO", encrypt: false, label: "MINIO-enc0" },
+    { remoteType: "MINIO", encrypt: true, label: "MINIO-enc1" },
+];
+
+for (const tc of matrixCases) {
+    test(`e2e matrix: ${tc.label}`, async () => {
+        await runScenario(tc.remoteType, tc.encrypt);
+    });
+}