Improve CLI output for redirection compatibility (v1.0.2)

- Move system messages (progress, status) to stderr for clean markdown output
- Keep only markdown content in stdout for proper file redirection
- Enable usage: npx mapdown ... > output.md to create clean markdown files
- Update version to 1.0.2

Changes:
- Progress tracking now uses process.stderr.write()
- Start/completion messages use console.error()
- Only markdown result goes to stdout via console.log()

Bump version 1.0.1

Add repository field to package.json for npm publish

- Fix npm publish error: provenance validation requires repository.url
- Add GitHub repository URL to enable proper provenance checks