feat(graph): demo-ready materializer + per-pod Team memory action

Materializer (live.ts) — cut demo-pod from 110 -> 22 nodes:
- cap to 8 recent collisions; collapse repeats by memorySignature
- collapse interventions to one (most recent) per collision
- filter junk 'files' (URLs, env vars, browser/app names, scratch/test) to
  real source paths only
- prune test-artifact engineers (a/b/verify/codex-check/-testrepo) + any node
  orphaned by that
- collisions referenced by accepted outcomes bypass the cap so the learned_from
  money path never drops; risk-paths metric counts distinct signatures

UI: per-pod 'Team memory' action on each PodCard's menu (replaces the header
button that always opened pods[0]).

Verified against live demo-pod data (joins connect); typechecks clean.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/App.tsx

@@ -268,10 +268,6 @@ export default function App() {
                 <ShieldCheckIcon data-icon="inline-start" />
                 Privacy-limited
               </Badge>
-              <Button variant="outline" onClick={() => setGraphPodId(pods[0]?.id ?? 'demo-pod')}>
-                <BrainCircuitIcon data-icon="inline-start" />
-                Team memory
-              </Button>
               <Button variant="outline" onClick={() => void refresh()} disabled={loading}>
                 <RefreshCwIcon data-icon="inline-start" />
                 Refresh
@@ -342,6 +338,7 @@ export default function App() {
                       onRemoveMember={handleRemoveMember}
                       onUpdate={handleUpdate}
                       onDelete={handleDelete}
+                      onOpenGraph={setGraphPodId}
                     />
                   ))}
                 </div>

frontend/src/components/PodCard.tsx

@@ -1,5 +1,12 @@
 import { useState } from 'react';
-import { MoreHorizontalIcon, PlusIcon, Trash2Icon, UserRoundIcon, VideoIcon } from 'lucide-react';
+import {
+  BrainCircuitIcon,
+  MoreHorizontalIcon,
+  PlusIcon,
+  Trash2Icon,
+  UserRoundIcon,
+  VideoIcon,
+} from 'lucide-react';
 import type { Pod, PodInput } from '@podman/shared';
 import { Avatar, AvatarBadge, AvatarFallback, AvatarGroup } from '@/components/ui/avatar';
 import { Badge } from '@/components/ui/badge';
@@ -42,6 +49,7 @@ export function PodCard({
   onRemoveMember: _onRemoveMember,
   onUpdate,
   onDelete,
+  onOpenGraph,
 }: {
   pod: Pod;
   busy: boolean;
@@ -52,6 +60,7 @@ export function PodCard({
   onRemoveMember: (id: string, name: string) => void;
   onUpdate: (id: string, patch: PodInput) => void;
   onDelete: (id: string) => void;
+  onOpenGraph: (id: string) => void;
 }) {
   const [newMember, setNewMember] = useState('');
   const [editing, setEditing] = useState(false);
@@ -100,6 +109,10 @@ export function PodCard({
               </DropdownMenuTrigger>
               <DropdownMenuContent align="end">
                 <DropdownMenuGroup>
+                  <DropdownMenuItem onSelect={() => onOpenGraph(pod.id)}>
+                    <BrainCircuitIcon />
+                    Team memory
+                  </DropdownMenuItem>
                   <DropdownMenuItem onSelect={() => setEditing(true)}>Edit pod</DropdownMenuItem>
                   <DropdownMenuItem
                     variant="destructive"