chore: upgrade Next.js 15.4.6 to 16.0.3 with full stack updates

Successfully upgraded the project from Next.js 15 to Next.js 16 stable release
with all related dependencies and configuration updates.

## Package Upgrades
- Next.js: 15.4.6 → 16.0.3
- React: 19.1.0 → 19.2.0
- React DOM: 19.1.0 → 19.2.0
- @types/react: 19.2.2 → 19.2.5
- @types/react-dom: 19.2.2 → 19.2.3
- eslint-config-next: 15.4.6 → 16.0.3

## Configuration Changes
- Removed --turbopack flag from dev script (now default in Next.js 16)
- Updated lint script from 'next lint' to 'eslint .' for better compatibility
- Migrated ESLint config from FlatCompat to native flat config format
- Removed @eslint/eslintrc dependency (no longer needed)
- Added pnpm overrides for React type definitions

## ESLint Configuration
- Converted from FlatCompat compatibility layer to direct import
- Now using eslint-config-next/core-web-vitals directly
- Added ignores for .next, node_modules, .cache, dist, and build directories
- Simplified configuration structure for better maintainability

## TypeScript Configuration
- Auto-updated by Next.js 16 build process
- Changed jsx from 'preserve' to 'react-jsx' (React automatic runtime)
- Added '.next/dev/types/**/*.ts' to include paths

## MCP Configuration
- Removed unused context7 MCP server configuration
- Updated next-devtools command to use direct npx instead of cmd wrapper

## Verification
- Build: ✅ Successful (compiled in 2.8s with Turbopack)
- Lint: ✅ No errors or warnings
- TypeScript: ✅ Type checking passed
- Browser: ✅ App loads and runs correctly

This upgrade brings all the latest Next.js 16 features and improvements
including Turbopack as the default bundler, improved build performance,
and enhanced developer experience.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

create-agentic-app/template/package.json

@@ -2,10 +2,10 @@
   "name": "agentic-coding-starter-kit",
   "version": "1.1.2",
   "scripts": {
-    "dev": "next dev --turbopack",
+    "dev": "next dev",
     "build": "pnpm run db:migrate && next build",
     "start": "next start",
-    "lint": "next lint",
+    "lint": "eslint .",
     "typecheck": "tsc --noEmit",
     "db:generate": "drizzle-kit generate",
     "db:migrate": "drizzle-kit migrate",
@@ -28,29 +28,34 @@
     "clsx": "^2.1.1",
     "drizzle-orm": "^0.44.7",
     "lucide-react": "^0.539.0",
-    "next": "15.4.6",
+    "next": "16.0.3",
     "next-themes": "^0.4.6",
     "pg": "^8.16.3",
     "postgres": "^3.4.7",
-    "react": "19.1.0",
-    "react-dom": "19.1.0",
+    "react": "19.2.0",
+    "react-dom": "19.2.0",
     "react-markdown": "^10.1.0",
     "tailwind-merge": "^3.3.1",
     "zod": "^4.1.12"
   },
   "devDependencies": {
-    "@eslint/eslintrc": "^3.3.1",
     "@tailwindcss/postcss": "^4.1.16",
     "@types/node": "^20.19.24",
     "@types/pg": "^8.15.6",
-    "@types/react": "^19.2.2",
-    "@types/react-dom": "^19.2.2",
+    "@types/react": "19.2.5",
+    "@types/react-dom": "19.2.3",
     "drizzle-kit": "^0.31.6",
     "eslint": "^9.39.0",
-    "eslint-config-next": "15.4.6",
+    "eslint-config-next": "16.0.3",
     "shadcn": "^3.5.0",
     "tailwindcss": "^4.1.16",
     "tw-animate-css": "^1.4.0",
     "typescript": "^5.9.3"
+  },
+  "pnpm": {
+    "overrides": {
+      "@types/react": "19.2.5",
+      "@types/react-dom": "19.2.3"
+    }
   }
 }