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/relay-disconnect-probe.mjs

@@ -0,0 +1,129 @@
+import { createRequire } from "node:module";
+import { pathToFileURL } from "node:url";
+import { RTCPeerConnection } from "werift";
+import { TrysteroReplicator } from "@vrtmrz/livesync-commonlib/compat/replication/trystero/TrysteroReplicator";
+
+const requireFromProbe = createRequire(import.meta.url);
+const commonlibEntry = requireFromProbe.resolve("@vrtmrz/livesync-commonlib/context");
+const requireFromCommonlib = createRequire(commonlibEntry);
+const nostrEntry = requireFromCommonlib.resolve("@trystero-p2p/nostr");
+const { getRelaySockets, joinRoom, pauseRelayReconnection } = await import(pathToFileURL(nostrEntry).href);
+
+const relayUrl = process.env.RELAY ?? "ws://nostr-relay:7777/";
+const timeoutMs = Number(process.env.RELAY_TIMEOUT_MS ?? 15_000);
+
+function delay(ms) {
+    return new Promise((resolve) => setTimeout(resolve, ms));
+}
+
+async function waitFor(description, predicate) {
+    const deadline = Date.now() + timeoutMs;
+    while (Date.now() <= deadline) {
+        if (predicate()) return;
+        await delay(50);
+    }
+    throw new Error(`Timed out waiting for ${description}`);
+}
+
+async function waitForSocketOpen(socket, description) {
+    if (socket.readyState === WebSocket.OPEN) {
+        // Node can expose OPEN before it dispatches the event. Yield once so
+        // Trystero's previously registered onopen handler has completed before
+        // this probe starts the close handshake.
+        await delay(0);
+        if (socket.readyState === WebSocket.OPEN) return;
+    }
+
+    await new Promise((resolve, reject) => {
+        const timeout = setTimeout(() => {
+            cleanup();
+            reject(new Error(`Timed out waiting for ${description}; readyState=${socket.readyState}`));
+        }, timeoutMs);
+        const cleanup = () => {
+            clearTimeout(timeout);
+            socket.removeEventListener("open", onOpen);
+            socket.removeEventListener("close", onClose);
+            socket.removeEventListener("error", onError);
+        };
+        const onOpen = () => {
+            cleanup();
+            resolve();
+        };
+        const onClose = () => {
+            cleanup();
+            reject(new Error(`${description} closed before opening`));
+        };
+        const onError = () => {
+            cleanup();
+            reject(new Error(`${description} failed before opening`));
+        };
+
+        // Trystero installs its onopen handler while constructing the socket,
+        // before this observer is registered. Waiting for the actual event
+        // therefore establishes transport readiness without a fixed delay.
+        socket.addEventListener("open", onOpen, { once: true });
+        socket.addEventListener("close", onClose, { once: true });
+        socket.addEventListener("error", onError, { once: true });
+    });
+}
+
+const room = joinRoom(
+    {
+        appId: `livesync-relay-disconnect-probe-${Date.now()}`,
+        password: "local-test-only",
+        relayConfig: {
+            urls: [relayUrl],
+            manualReconnection: true,
+        },
+        rtcPolyfill: RTCPeerConnection,
+    },
+    "disconnect-probe"
+);
+
+try {
+    await waitFor("the relay WebSocket to be registered", () => Object.values(getRelaySockets()).length > 0);
+    const originalSockets = Object.values(getRelaySockets());
+    await Promise.all(
+        originalSockets.map((socket, index) => waitForSocketOpen(socket, `relay WebSocket ${index + 1} to open`))
+    );
+
+    const replicator = new TrysteroReplicator(
+        {},
+        {
+            close: async () => undefined,
+            dispatchConnectionStatus: async () => undefined,
+        }
+    );
+    replicator.disconnectFromServer();
+
+    await waitFor("all relay WebSockets to close", () =>
+        originalSockets.every((socket) => socket.readyState === WebSocket.CLOSED)
+    );
+    await delay(4_000);
+    if (!originalSockets.every((socket) => socket.readyState === WebSocket.CLOSED)) {
+        throw new Error("A relay WebSocket reconnected while reconnection was paused");
+    }
+
+    replicator.allowReconnection();
+    await waitFor("a replacement relay WebSocket to be registered", () =>
+        Object.values(getRelaySockets()).some((socket) => !originalSockets.includes(socket))
+    );
+    const replacementSockets = Object.values(getRelaySockets()).filter((socket) => !originalSockets.includes(socket));
+    await Promise.all(
+        replacementSockets.map((socket, index) =>
+            waitForSocketOpen(socket, `replacement relay WebSocket ${index + 1} to open`)
+        )
+    );
+
+    console.log(
+        JSON.stringify({
+            socketsClosed: originalSockets.length,
+            stayedDisconnectedWhilePaused: true,
+            reconnectedAfterResume: true,
+        })
+    );
+} finally {
+    await room.leave();
+    pauseRelayReconnection();
+    for (const socket of Object.values(getRelaySockets())) socket.close();
+}