[Init] Initial commit - NetMesh terminal manager

electron/bridges/systemManager/execConnHealth.cjs

@@ -0,0 +1,27 @@
+"use strict";
+
+/** Best-effort check that an ssh2 Client transport is still usable. */
+function isSshConnAlive(conn) {
+  if (!conn) return false;
+  const sock = conn._sock;
+  if (sock && sock.destroyed) return false;
+  return true;
+}
+
+/** True when conn.exec failed because the underlying transport/channel is gone. */
+function isTransportExecError(message) {
+  const msg = String(message || "").toLowerCase();
+  return (
+    msg.includes("not connected")
+    || msg.includes("connection lost")
+    || msg.includes("socket hang up")
+    || msg.includes("econnreset")
+    || msg.includes("closed")
+    || msg.includes("destroyed")
+    || msg.includes("channel open failure")
+    || msg.includes("unable to exec")
+    || msg.includes("no response")
+  );
+}
+
+module.exports = { isSshConnAlive, isTransportExecError };