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

README.md

@@ -0,0 +1,103 @@
+# Comprehensive Tagging System
+
+A Python-based comprehensive tagging system for Obsidian vaults that analyzes files, generates appropriate tags based on directory structure and content analysis, and updates frontmatter while preserving existing data.
+
+## Features
+
+- **Directory-based tagging**: Automatically generates tags based on vault directory structure
+- **Content analysis**: Analyzes file content to extract topics, technologies, and entities
+- **Hierarchical tag structures**: Creates organized tag hierarchies using forward slash notation
+- **Language detection**: Identifies content language (English, Chinese, mixed, unknown)
+- **Frontmatter management**: Updates YAML frontmatter while preserving existing data
+- **Batch processing**: Processes entire vaults efficiently with progress tracking
+- **Sensitive content detection**: Identifies and appropriately tags sensitive information
+- **Obsidian compatibility**: Ensures tags work with Obsidian's features and plugins
+
+## Installation
+
+```bash
+pip install -e .
+```
+
+## Development Setup
+
+```bash
+# Install development dependencies
+pip install -e ".[dev,test]"
+
+# Run tests
+pytest
+
+# Run tests with coverage
+pytest --cov=tagging_system
+
+# Format code
+black tagging_system tests
+
+# Lint code
+flake8 tagging_system tests
+
+# Type checking
+mypy tagging_system
+```
+
+## Project Structure
+
+```
+tagging_system/
+├── __init__.py
+├── core/
+│   ├── __init__.py
+│   ├── models.py          # Core data models
+│   └── interfaces.py      # Abstract interfaces and protocols
+├── config/
+│   ├── __init__.py
+│   └── config.py          # Configuration system
+└── implementations/       # Concrete implementations (to be added)
+
+tests/
+├── __init__.py
+├── conftest.py           # Pytest configuration and fixtures
+├── test_models.py        # Tests for core models
+├── test_config.py        # Tests for configuration system
+└── test_interfaces.py    # Tests for interfaces and protocols
+```
+
+## Configuration
+
+The system uses a flexible configuration system that supports both YAML and JSON formats. Configuration includes:
+
+- Directory mappings for tag generation
+- Tag hierarchies and structures
+- Sensitive content detection patterns
+- File processing settings
+- Language detection parameters
+
+## Testing
+
+The project uses pytest with hypothesis for property-based testing:
+
+- **Unit tests**: Test specific functionality and edge cases
+- **Property-based tests**: Test universal properties across randomized inputs
+- **Integration tests**: Test component interactions
+
+Run tests with:
+```bash
+pytest                    # Run all tests
+pytest -m unit           # Run only unit tests
+pytest -m property       # Run only property-based tests
+pytest -v                # Verbose output
+```
+
+## Requirements
+
+This implementation addresses the following requirements:
+- 1.1, 1.2, 1.3: Standardized frontmatter structure
+- Directory-based tag mapping
+- Content analysis and classification
+- Tag consistency and validation
+- Batch processing capabilities
+
+## License
+
+MIT License