Fix bugs found in full security and stability audit.

Harden artifact paths and fusion uploads, repair pool reconnect and login ID tracking, fix agent/fusion/frontend regressions, and refresh PROBLEMS.md with the full findings list.

server/web/src/pages/AgentsPage.tsx

@@ -45,6 +45,12 @@ export default function AgentsPage() {
       .finally(() => setLoading(false));
   }, []);
 
+  useEffect(() => {
+    if (!selectedAgent) return;
+    setNotesDraft(selectedAgent.notes || '');
+    setTagsDraft((selectedAgent.tags || []).join(', '));
+  }, [selectedAgent?.id]);
+
   useEffect(() => {
     if (!isConnected) return;
     setAgents(liveAgents);
@@ -52,8 +58,6 @@ export default function AgentsPage() {
     const updated = liveAgents.find((a) => a.id === selectedAgent.id);
     if (updated) {
       setSelectedAgent(updated);
-      setNotesDraft(updated.notes || '');
-      setTagsDraft((updated.tags || []).join(', '));
     } else {
       setSelectedAgent(null);
       setLogContent('');