feat(tagging-system): Add comprehensive tagging system implementation

- Add tagging system Python package with modular architecture (config, core, impl)
- Create core interfaces for file discovery, content analysis, and tag generation
- Implement content analyzer with language detection and topic extraction
- Implement file discovery engine with directory scanning and filtering
- Implement tag generator with hierarchical tag creation and consolidation
- Add configuration management with example config and validation
- Create comprehensive design and requirements documentation in .kiro/specs
- Add pytest test suite with unit tests for models, interfaces, and config
- Add setup.py, requirements.txt, and pytest.ini for package management
- Add README.md with project overview and usage instructions
- Update workspace.json with new project structure
- Add Excalidraw diagram for system architecture visualization
- Establish foundation for automated vault tagging and metadata management

requirements.txt

@@ -0,0 +1,14 @@
+# Core dependencies
+pyyaml>=6.0
+python-frontmatter>=1.0.0
+chardet>=5.0.0
+
+# Testing dependencies
+pytest>=7.0.0
+hypothesis>=6.0.0
+pytest-cov>=4.0.0
+
+# Development dependencies
+black>=22.0.0
+flake8>=5.0.0
+mypy>=1.0.0