Fixa native builds + CJS-interop; lås beroenden; verifierad slice

- pnpm-workspace.yaml: allowBuilds för esbuild + node-pty (pnpm 11 ersätter
  onlyBuiltDependencies-listan)
- pnpm-lock.yaml: committa låsfilen
- server: @xterm/headless + @xterm/addon-serialize är CommonJS — default-
  importera värdet och ta typen via 'import type' (annars ESM-named-export-fel
  i runtime trots att typecheck passerar)
- daemon: städa pty-processen även vid SIGTERM

Verifierat lokalt: alla paket typecheckar, web bundlar (vite), och rök-test av
server<->daemon<->klient passerar (token-auth, registrering, snapshot,
input->pty->output).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packages/daemon/src/index.ts

@@ -93,9 +93,11 @@ pty.onExit(({ exitCode }) => {
   setTimeout(() => process.exit(exitCode), 200);
 });
 
-process.on("SIGINT", () => {
+function shutdown(): void {
   pty.kill();
   process.exit(0);
-});
+}
+process.on("SIGINT", shutdown);
+process.on("SIGTERM", shutdown);
 
 connect();

packages/server/src/index.ts

@@ -11,8 +11,12 @@
  */
 import http from "node:http";
 import { WebSocketServer, WebSocket } from "ws";
-import { Terminal } from "@xterm/headless";
-import { SerializeAddon } from "@xterm/addon-serialize";
+// @xterm/headless och addon-serialize är CommonJS — default-importera värdet och
+// destrukturera; ta typen via `import type` (raderas i runtime).
+import XtermHeadless from "@xterm/headless";
+import type { Terminal as TerminalType } from "@xterm/headless";
+import XtermSerialize from "@xterm/addon-serialize";
+import type { SerializeAddon as SerializeAddonType } from "@xterm/addon-serialize";
 import type {
   DaemonHello,
   DaemonMessage,
@@ -22,6 +26,9 @@ import type {
 } from "@agent-helm/shared";
 import { parseMessage } from "@agent-helm/shared";
 
+const { Terminal } = XtermHeadless;
+const { SerializeAddon } = XtermSerialize;
+
 const TOKEN = process.env.AGENT_HELM_TOKEN ?? "";
 const PORT = Number(process.env.PORT ?? 8787);
 
@@ -33,8 +40,8 @@ if (!TOKEN) {
 interface Session {
   meta: SessionMeta;
   daemon: WebSocket | null;
-  term: Terminal;
-  serializer: SerializeAddon;
+  term: TerminalType;
+  serializer: SerializeAddonType;
   subscribers: Set<WebSocket>;
 }