debug: add INFO level log for empty endpoints

Log at INFO level (every minute) when no challenge endpoints are registered.
This will help confirm if the outbox polling task is running at all.

Author: echobt

bins/validator-node/src/main.rs

@@ -1656,7 +1656,12 @@ async fn run_validator() -> Result<()> {
                 };
 
                 if endpoints.is_empty() {
-                    debug!("P2P outbox poll: no challenge endpoints registered yet");
+                    // Log at info level occasionally to confirm task is running
+                    static EMPTY_COUNT: std::sync::atomic::AtomicU32 = std::sync::atomic::AtomicU32::new(0);
+                    let count = EMPTY_COUNT.fetch_add(1, std::sync::atomic::Ordering::Relaxed);
+                    if count % 12 == 0 { // Log every minute (12 * 5s = 60s)
+                        info!("P2P outbox poll: no challenge endpoints registered yet (poll #{count})");
+                    }
                     continue;
                 }
 
@@ -1666,13 +1671,12 @@ async fn run_validator() -> Result<()> {
                     state.challenge_configs.iter().map(|(k, v)| (k.to_string(), v.clone())).collect()
                 };
 
-                for (challenge_id, endpoint) in endpoints {
+                for (challenge_id, endpoint) in &endpoints {
                     // Use the real endpoint (includes suffix like challenge-term-challenge-4133b3431b1c)
                     let outbox_url = format!("{}/p2p/outbox", endpoint);
-                    debug!("Polling outbox: {} -> {}", challenge_id, outbox_url);
 
                     // Get config for this challenge
-                    let config = match configs.get(&challenge_id) {
+                    let config = match configs.get(challenge_id) {
                         Some(c) => c.clone(),
                         None => {
                             debug!("No config found for challenge {}, skipping", challenge_id);