fix: wire conversation panel to DAG nodes with toggle support

- Add MessageSquare icon to GraphNodeCard; prop-thread onConversationOpen
  and selectedTaskId through WorkflowGraph node data (no useUrlState
  inside ReactFlow nodes — avoids context/timing issues)
- Fix ContextualRightPanel: check taskId before epicId so clicking the
  conversation icon always opens ThreadDrawer even when an epic filter
  is active
- setEpicId now clears task from URL so selecting an epic resets any
  open conversation thread
- handleGraphSelect toggles: second click on same node calls setTaskId(null)
  closing the right panel
- Add onSelect to WorkflowGraph flowModel deps to prevent stale callbacks
- Fix ContextualRightPanel onClose no-ops: wired to setTaskId(null) /
  setSwarmId(null) so back button works
- Right panel always visible (removed panel==='open' gate in UnifiedShell)
- SmartDag task grid: horizontal scroll, fixed-width cards, hideClosed=true
- Add <Suspense> in page.tsx for useSearchParams compatibility
- Enable dolt auto-start in .beads/config.yaml
- Add 14 static analysis tests (graph-node-conversation.test.tsx)

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

src/app/page.tsx

@@ -1,3 +1,4 @@
+import { Suspense } from 'react';
 import { UnifiedShell } from '../components/shared/unified-shell';
 import { readIssuesForScope } from '../lib/aggregate-read';
 import { resolveProjectScope } from '../lib/project-scope';
@@ -28,12 +29,14 @@ export default async function Page({ searchParams }: PageProps) {
   });
   
   return (
-    <UnifiedShell
-      issues={issues}
-      projectRoot={scope.selected.root}
-      projectScopeKey={scope.selected.key}
-      projectScopeOptions={scope.options}
-      projectScopeMode={scope.mode}
-    />
+    <Suspense>
+      <UnifiedShell
+        issues={issues}
+        projectRoot={scope.selected.root}
+        projectScopeKey={scope.selected.key}
+        projectScopeOptions={scope.options}
+        projectScopeMode={scope.mode}
+      />
+    </Suspense>
   );
 }