Fix command palette: agent ID propagation, result selection, and scope tabs

- Propagate authenticated agent identity through write buffers via
  TaggedExecution/TaggedDiagram wrappers so ClickHouse rows get real
  agent IDs instead of empty strings
- Add execution_id to text search LIKE clause so selecting an execution
  by ID in the palette actually finds it
- Clear status filter to all three statuses on palette selection so the
  chosen execution/agent isn't filtered out
- Add disabled Routes and Exchanges scope tabs with "coming soon" state

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

ui/src/components/command-palette/CommandPalette.tsx

@@ -22,12 +22,14 @@ export function CommandPalette() {
     (result: PaletteResult) => {
       if (result.type === 'execution') {
         const exec = result.data as ExecutionSummary;
+        execSearch.setStatus(['COMPLETED', 'FAILED', 'RUNNING']);
         execSearch.setText(exec.executionId);
         execSearch.setRouteId('');
         execSearch.setAgentId('');
         execSearch.setProcessorType('');
       } else if (result.type === 'agent') {
         const agent = result.data as AgentInstance;
+        execSearch.setStatus(['COMPLETED', 'FAILED', 'RUNNING']);
         execSearch.setAgentId(agent.agentId);
         execSearch.setText('');
         execSearch.setRouteId('');

ui/src/components/command-palette/ResultsList.tsx

@@ -11,7 +11,7 @@ interface ResultsListProps {
 }
 
 export function ResultsList({ results, isLoading, onSelect }: ResultsListProps) {
-  const { selectedIndex, query } = useCommandPalette();
+  const { selectedIndex, query, scope } = useCommandPalette();
   const listRef = useRef<HTMLDivElement>(null);
 
   useEffect(() => {
@@ -21,6 +21,24 @@ export function ResultsList({ results, isLoading, onSelect }: ResultsListProps)
     items?.[selectedIndex]?.scrollIntoView({ block: 'nearest' });
   }, [selectedIndex]);
 
+  if (scope === 'routes' || scope === 'exchanges') {
+    const label = scope === 'routes' ? 'Route' : 'Exchange';
+    return (
+      <div className={styles.results}>
+        <div className={styles.emptyState}>
+          <svg className={styles.emptyIcon} viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.5">
+            <path d="M12 6v6l4 2" />
+            <circle cx="12" cy="12" r="10" />
+          </svg>
+          <span className={styles.emptyText}>{label} search coming soon</span>
+          <span className={styles.emptyHint}>
+            This feature is planned for a future release
+          </span>
+        </div>
+      </div>
+    );
+  }
+
   if (isLoading && results.length === 0) {
     return (
       <div className={styles.results}>

ui/src/components/command-palette/ScopeTabs.tsx

@@ -10,16 +10,18 @@ const SCOPES: { key: PaletteScope; label: string; disabled?: boolean }[] = [
   { key: 'all', label: 'All' },
   { key: 'executions', label: 'Executions' },
   { key: 'agents', label: 'Agents' },
+  { key: 'routes', label: 'Routes', disabled: true },
+  { key: 'exchanges', label: 'Exchanges', disabled: true },
 ];
 
 export function ScopeTabs({ executionCount, agentCount }: ScopeTabsProps) {
   const { scope, setScope } = useCommandPalette();
 
-  function getCount(key: PaletteScope): number {
+  function getCount(key: PaletteScope): string | number {
     if (key === 'all') return executionCount + agentCount;
     if (key === 'executions') return executionCount;
     if (key === 'agents') return agentCount;
-    return 0;
+    return '\u2014';
   }
 
   return (
@@ -27,7 +29,13 @@ export function ScopeTabs({ executionCount, agentCount }: ScopeTabsProps) {
       {SCOPES.map((s) => (
         <button
           key={s.key}
-          className={scope === s.key ? styles.scopeTabActive : styles.scopeTab}
+          className={
+            s.disabled
+              ? styles.scopeTabDisabled
+              : scope === s.key
+                ? styles.scopeTabActive
+                : styles.scopeTab
+          }
           onClick={() => !s.disabled && setScope(s.key)}
         >
           {s.label}

ui/src/components/command-palette/use-command-palette.ts

@@ -1,6 +1,6 @@
 import { create } from 'zustand';
 
-export type PaletteScope = 'all' | 'executions' | 'agents';
+export type PaletteScope = 'all' | 'executions' | 'agents' | 'routes' | 'exchanges';
 
 export interface PaletteFilter {
   key: 'status' | 'route' | 'agent' | 'processor';