Stop waiting for approval when the terminal closes

SIGHUP while waiting for approval released the config lock but left the
host polling, as only SIGINT and SIGTERM stopped the wait.

packages/host/host.ts

@@ -232,6 +232,7 @@ async function startHost() {
 		const onSignal = () => { abort.abort(); };
 		process.on("SIGINT", onSignal);
 		process.on("SIGTERM", onSignal);
+		process.on("SIGHUP", onSignal);
 		try {
 			await ensurePaired(hostConfig, {
 				version: packageConfig.version,
@@ -253,6 +254,7 @@ async function startHost() {
 		} finally {
 			process.off("SIGINT", onSignal);
 			process.off("SIGTERM", onSignal);
+			process.off("SIGHUP", onSignal);
 		}
 	}