chore: bump version to 1.1.29 and remove boilerplate-improvements specs

Changes:
- Bump package version from 1.1.28 to 1.1.29
- Remove template/specs/boilerplate-improvements/ directory
  - Deleted implementation-plan.md (165 lines)
  - Deleted requirements.md (131 lines)

The boilerplate-improvements specs have been cleared as they were
either completed or no longer needed in the template.

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

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

create-agentic-app/package.json

@@ -1,6 +1,6 @@
 {
   "name": "create-agentic-app",
-  "version": "1.1.28",
+  "version": "1.1.29",
   "description": "Scaffold a new agentic AI application with Next.js, Better Auth, and AI SDK",
   "type": "module",
   "bin": {