- Add ProjectManager with milestone and label-based project organization
- Support project states (Todo, Active, Review, Done, Blocked) via labels
- Add priority management (Low, Medium, High, Critical) with label integration
- Implement milestone creation and management for project tracking
- Enhance IssueWriter with project management methods (assign_to_milestone, add/remove_labels)
- Add 8 new CLI commands for complete project management workflow
- Support automatic project management setup with ensure_project_labels()
- Enable issue state transitions with automatic closing for completed issues
- Integrate with existing Gitea API authentication and error handling patterns
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Co-Authored-By: Claude <noreply@anthropic.com>