Enhance the versioning workflow to include PR title and description in tag messages.
Changes:
- Add PR information extraction step using GitHub API
- Format tag messages with version, PR title, and description
- Apply structured messages to stable, latest, and version tags
- Handle fallback cases for manual dispatches and API errors
- Use temporary file approach for reliable multiline message handling
Tag descriptions now follow the format:
`# v{version} - {PR title}`
This improves release traceability by providing clear context
for what changes are included in each tagged version.
