From 3c012efbead6ac7bfab2acacca8bc255599b6282 Mon Sep 17 00:00:00 2001
From: damocles <damocles@hyperhive>
Date: Sun, 31 May 2026 21:17:12 +0200
Subject: [PATCH] fix(#883): warn + bail on unparseable subnet instead of
 silently writing empty LOCAL_ADDRESS; doc /0 corner case

---
 hive-c0re/src/lifecycle.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/hive-c0re/src/lifecycle.rs b/hive-c0re/src/lifecycle.rs
index 5f1139eb..1cfdfa83 100644
--- a/hive-c0re/src/lifecycle.rs
+++ b/hive-c0re/src/lifecycle.rs
@@ -101,6 +101,8 @@ pub fn agent_network_ip(name: &str, subnet_cidr: &str) -> Option<String> {
     let prefix_len: u32 = prefix_str.parse().ok()?;
     if prefix_len > 30 {
         // /31 and /32 have no room for agents; /30 has 1 usable slot.
+        // /0 (the other extreme) is handled further down: host_count
+        // overflows checked_shl(32) → 0 → usable = 0 → None.
         return None;
     }
     // Parse dotted-decimal IPv4.