fix(l1): make contact lookup and mutation cover replacement lists

KBucket::get_mut and get_contact only searched the main contact list,
so any state mutation (set_disposable, ping tracking, find_node count,
mark_knows_us) silently failed for contacts in the replacement list.
Since iter_contacts and do_get_contact_to_initiate now return
replacement contacts, this caused phantom contacts that were visible
to selection but invisible to updates.

Update get_contact to use get_any (main + replacements) and get_mut
to search both lists, ensuring all contact state mutations work
regardless of which list holds the contact.

Author: azteca1998

crates/networking/p2p/peer_table.rs

@@ -86,9 +86,12 @@ impl KBucket {
         })
     }
 
-    /// Find a mutable reference to a contact by node ID within this bucket.
+    /// Find a mutable reference to a contact by node ID (main or replacement list).
     fn get_mut(&mut self, node_id: &H256) -> Option<&mut Contact> {
-        self.contacts
+        if let Some((_, c)) = self.contacts.iter_mut().find(|(id, _)| id == node_id) {
+            return Some(c);
+        }
+        self.replacements
             .iter_mut()
             .find(|(id, _)| id == node_id)
             .map(|(_, c)| c)
@@ -909,10 +912,10 @@ impl PeerTableServer {
         bucket_index(&self.local_node_id, node_id)
     }
 
-    /// Look up a contact by node ID (O(K) within the bucket).
+    /// Look up a contact by node ID in main or replacement list (O(K) within the bucket).
     fn get_contact(&self, node_id: &H256) -> Option<&Contact> {
         let idx = self.bucket_for(node_id)?;
-        self.buckets[idx].get(node_id)
+        self.buckets[idx].get_any(node_id)
     }
 
     /// Look up a mutable reference to a contact by node ID.