feat: add composition graph view for cookbook patterns

Interactive node graph using @xyflow/react showing all patterns and their
relationships (registryDependencies, composes_with, extends, conflicts_with).
Nodes sized by complexity, colored by category, with elkjs auto-layout.
Includes category/industry filters and hover highlighting.

Author: bjcoombs

frontend/package-lock.json

@@ -31,11 +31,13 @@
     "@tanstack/react-query": "^5.90.21",
     "@tanstack/react-query-devtools": "^5.91.3",
     "@tanstack/react-table": "^8.21.3",
+    "@xyflow/react": "^12.10.1",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
     "cmdk": "^1.1.1",
     "codemirror": "^6.0.2",
     "date-fns": "^4.1.0",
+    "elkjs": "^0.11.1",
     "lucide-react": "^0.575.0",
     "radix-ui": "^1.4.3",
     "react": "^19.2.0",

frontend/package.json

@@ -30,7 +30,7 @@ import { DashboardPage } from '@/features/dashboard'
 import { ManifestsPage } from '@/features/manifests'
 import { McpConfigPage } from '@/features/mcp-config'
 import { TransactionsPage } from '@/features/transactions'
-import { CookbookPage, CookbookDetailPage } from '@/features/cookbook'
+import { CookbookPage, CookbookDetailPage, CookbookGraphPage } from '@/features/cookbook'
 import { ThemePreviewPanel } from '@/components/dev/theme-preview-panel'
 
 // Placeholder page components - replaced as each page task is implemented
@@ -258,6 +258,7 @@ function AppShellLayout() {
         <Route path="/manifests" element={<FeatureGuard feature="manifests">{guarded(<ManifestsPage />)}</FeatureGuard>} />
         <Route path="/mcp-config" element={<FeatureGuard feature="mcp-config">{guarded(<McpConfigPage />)}</FeatureGuard>} />
         <Route path="/cookbook" element={guarded(<CookbookPage />)} />
+        <Route path="/cookbook/graph" element={guarded(<CookbookGraphPage />)} />
         <Route path="/cookbook/:name" element={guarded(<CookbookDetailPage />)} />
         <Route path="/audit-log" element={<FeatureGuard feature="audit">{guarded(<AuditLogPage />)}</FeatureGuard>} />