ark: skip refresh when ark unconfigured; document LN listener watchdog

Guard refreshArkWallet against running when config.ark.arkPrivateKey is
unset, and add a comment explaining the ensureListenerAlive watchdog's
zombie-socket recovery.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

2 files changed, 4 insertions, 0 deletions

diff --git a/lib/ark.ts b/lib/ark.ts
index a37197e8..41515d54 100644
--- a/lib/ark.ts
+++ b/lib/ark.ts
@@ -59,6 +59,7 @@ const withTimeout = <T>(promise: Promise<T>, ms: number, label: string) =>
   ]);
 
 export const refreshArkWallet = async (force = false) => {
+  if (!config.ark?.arkPrivateKey) return; // ark disabled
   const now = Date.now();
   if (refreshing || (!force && now - lastRefresh < REFRESH_COOLDOWN)) return;
   try {
diff --git a/lib/lightning.ts b/lib/lightning.ts
index 9e259ed5..2f5f4f00 100644
--- a/lib/lightning.ts
+++ b/lib/lightning.ts
@@ -127,6 +127,9 @@ export async function listenForLightning() {
   }
 }
 
+// Watchdog (run periodically): restart a dead listener, or recycle a zombie one
+// that's been blocked in waitanyinvoice far past any normal quiet period while cl
+// is actually alive (the dead-listen-socket case).
 export async function ensureListenerAlive() {
   if (!listenerActive) {
     warn("lightning listener: not active, restarting");