feat(tools): create @tpmjs/createblogpost test tool package

Add test tool package to verify sync system can discover and process tools:

Package Features:
- Creates structured blog posts with frontmatter and metadata
- Supports both Markdown and MDX output formats
- Automatic slug generation from title
- Word count and reading time calculation
- SEO-friendly metadata generation

TPMJS Integration:
- Rich-tier tpmjs field with all optional metadata
- Tagged with 'tpmjs-tool' keyword for NPM discovery
- Complete parameter and return type documentation
- AI agent guidance for optimal LLM usage
- Pricing, authentication, and framework metadata

Implementation:
- Full TypeScript implementation with exported types
- Proper tsconfig and tsup build configuration
- Comprehensive README with usage examples
- Changeset for publishing workflow
- Added packages/tools/* to pnpm workspace

This package serves as an end-to-end test of the sync workers to verify:
1. NPM keyword search discovers the package
2. Changes feed picks up updates
3. tpmjs field validation works correctly
4. Rich-tier metadata is properly extracted
5. Quality score calculation functions

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

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

pnpm-workspace.yaml

@@ -4,3 +4,4 @@ packages:
   - 'packages/config/eslint'
   - 'packages/config/tailwind'
   - 'packages/config/tsconfig'
+  - 'packages/tools/*'