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-remote-administration-exit-codes.ts

@@ -0,0 +1,83 @@
+import { test } from "node:test";
+import assert from "node:assert/strict";
+import { mkdir } from "node:fs/promises";
+import { TempDir } from "./helpers/temp.ts";
+import { runCli } from "./helpers/cli.ts";
+import { applyCouchdbSettings, applyP2pSettings, applyP2pTestTweaks, initSettingsFile } from "./helpers/settings.ts";
+
+function assertStringIncludes(actual: string, expected: string, message?: string): void {
+    assert.ok(actual.includes(expected), message ?? `Expected ${JSON.stringify(actual)} to include ${JSON.stringify(expected)}`);
+}
+
+async function prepareFixture(prefix: string) {
+    const workDir = await TempDir.create(prefix);
+    const settingsFile = workDir.join("settings.json");
+    const databaseDir = workDir.join("database");
+    await mkdir(databaseDir, { recursive: true });
+    await initSettingsFile(settingsFile);
+    return { workDir, settingsFile, databaseDir };
+}
+
+test("remote administration process exit policy distinguishes returned verification failure", async () => {
+    const fixture = await prepareFixture("livesync-cli-remote-admin-exit");
+    await using workDir = fixture.workDir;
+    const { settingsFile, databaseDir } = fixture;
+
+    await applyP2pSettings(
+        settingsFile,
+        "remote-admin-exit-room",
+        "remote-admin-exit-passphrase",
+        "remote-admin-exit-tests",
+        "ws://127.0.0.1:1/",
+        "~.*",
+        "none"
+    );
+    await applyP2pTestTweaks(settingsFile, "remote-admin-exit-device", "remote-admin-exit-passphrase");
+
+    const defaultFailure = await runCli(databaseDir, "--settings", settingsFile, "mark-resolved");
+    assert.deepStrictEqual(defaultFailure.code, 1, defaultFailure.combined);
+    assertStringIncludes(
+        defaultFailure.combined,
+        "[Verification] Remote administration is unavailable for this provider."
+    );
+    assertStringIncludes(defaultFailure.combined, "[Error] Command 'mark-resolved' failed");
+
+    const compatibilitySuccess = await runCli(
+        databaseDir,
+        "--settings",
+        settingsFile,
+        "--compat-remote-admin-exit-zero",
+        "mark-resolved"
+    );
+    assert.deepStrictEqual(compatibilitySuccess.code, 0, compatibilitySuccess.combined);
+    assertStringIncludes(
+        compatibilitySuccess.combined,
+        "[Verification] Remote administration is unavailable for this provider."
+    );
+    assertStringIncludes(compatibilitySuccess.combined, "[Done] Command 'mark-resolved' completed");
+});
+
+test("remote administration compatibility does not hide a thrown mutation failure", async () => {
+    const fixture = await prepareFixture("livesync-cli-remote-admin-mutation");
+    await using workDir = fixture.workDir;
+    const { settingsFile, databaseDir } = fixture;
+
+    await applyCouchdbSettings(
+        settingsFile,
+        "http://127.0.0.1:1/",
+        "unreachable-user",
+        "unreachable-password",
+        "unreachable-database"
+    );
+
+    const mutationFailure = await runCli(
+        databaseDir,
+        "--settings",
+        settingsFile,
+        "--compat-remote-admin-exit-zero",
+        "mark-resolved"
+    );
+    assert.deepStrictEqual(mutationFailure.code, 1, mutationFailure.combined);
+    assertStringIncludes(mutationFailure.combined, "[Command] mark-resolved");
+    assertStringIncludes(mutationFailure.combined, "[Error] Failed to start:");
+});