feat: complete Issue #150 - Advanced Packaging Features (.mdz, .mdt)

Implement comprehensive advanced packaging system using complete TDD8 methodology: ## Core Features Delivered - **MDZ Format**: Self-contained ZIP packages with embedded assets and metadata - **Transclusion Engine**: Dynamic content inclusion with variables and conditionals - **Asset Management**: Automated discovery, integrity validation, and path rewriting - **Variant Integration**: Seamless integration with existing explode-implode system ## Technical Implementation - **53 comprehensive tests** with 100% coverage for new functionality - **Circular import resolution** using lazy loading pattern in variant factory - **Cross-platform compatibility** with proper path handling - **Robust error handling** with specialized exception hierarchy ## Quality Assurance - ✅ All 1798 tests passing (100% system compatibility maintained) - ✅ Complete documentation (user guide + API reference) - ✅ Working demonstration script showcasing all features - ✅ Zero breaking changes to existing functionality ## Files Added/Modified - **Core Implementation**: 17 new files (4,149+ lines) - **Documentation**: Complete user and API documentation - **Tests**: 53 new tests across 3 test modules - **Integration**: Enhanced variant factory with MDZ support Built on solid foundation from Issues #148-149. Production-ready with comprehensive test coverage and full backward compatibility. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
2025-10-13 23:09:18 +02:00
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+# Advanced Packaging Features
+
+**Issue #150 Implementation**: Complete support for advanced packaging formats including .mdz (Markdown Zip) and transclusion engine for .mdt (Markdown Transcluded) formats.
+
+## Overview
+
+MarkiTect's advanced packaging system provides sophisticated document packaging capabilities built on the solid foundation of the explode-implode variant system (Issues #148-149). The system supports:
+
+- **📦 MDZ Format**: Self-contained markdown packages with embedded assets
+- **🔗 Transclusion Engine**: Template-based documents with dynamic content inclusion
+- **🔧 Asset Management**: Automated asset discovery, embedding, and path rewriting
+- **✅ Integrity Validation**: Checksum verification and cross-platform compatibility
+
+## Package Formats
+
+### MDZ (Markdown Zip) Format
+
+MDZ packages are self-contained ZIP archives that include markdown content, embedded assets, and metadata.
+
+#### Structure
+```
+document.mdz
+├── content.md          # Main markdown content with rewritten asset paths
+├── assets/             # Embedded assets directory
+│   ├── image1.png
+│   ├── style.css
+│   └── ...
+└── package.json        # Package metadata and manifest
+```
+
+#### Creating MDZ Packages
+
+```python
+from markitect.packaging.mdz_variant import MdzVariant
+
+# Create MDZ variant
+mdz = MdzVariant()
+
+# Package a markdown file with assets
+result = mdz.create_package(
+    source_path=Path("document.md"),
+    options={
+        'output_path': Path("document.mdz"),
+        'compression_level': 6  # Optional: ZIP compression level
+    }
+)
+
+print(f"Package created: {result['package_path']}")
+print(f"Assets embedded: {result['assets_embedded']}")
+```
+
+#### Extracting MDZ Packages
+
+```python
+# Extract package contents
+result = mdz.extract_package(
+    package_path=Path("document.mdz"),
+    options={
+        'output_dir': Path("extracted_content/")
+    }
+)
+
+print(f"Files extracted: {result['files_extracted']}")
+```
+
+### MDT (Markdown Transcluded) Format
+
+MDT format uses the transclusion engine to create template-based documents with dynamic content inclusion.
+
+#### Transclusion Directives
+
+##### File Inclusion
+```markdown
+# My Document
+
+{{include "header.md"}}
+
+## Main Content
+
+{{include "sections/introduction.md"}}
+
+{{include "footer.md"}}
+```
+
+##### Variable Substitution
+```markdown
+# {{title}}
+
+Author: {{author}}
+Version: {{version}}
+
+{{include "content.md" title="Advanced Guide" author="MarkiTect"}}
+```
+
+##### Conditional Content
+```markdown
+{{if debug}}
+**Debug Mode**: This content only appears when debug=true
+{{endif}}
+```
+
+#### Using the Transclusion Engine
+
+```python
+from markitect.packaging.transclusion import TransclusionEngine
+
+# Create engine with base path and variables
+engine = TransclusionEngine(
+    base_path=Path("templates/"),
+    variables={
+        'title': 'Advanced Guide',
+        'author': 'MarkiTect Team',
+        'version': '2.0',
+        'debug': True
+    }
+)
+
+# Process a template file
+result = engine.process_file(Path("document.mdt"))
+print(result)  # Fully processed content with includes resolved
+```
+
+## Asset Management
+
+### Automatic Asset Discovery
+
+The system automatically discovers assets referenced in markdown content:
+
+```python
+from markitect.packaging.asset_utils import discover_assets
+
+# Discover assets in a directory
+assets = discover_assets(Path("project/"))
+
+# Discover assets from content
+content = "![Image](./images/photo.jpg) [Link](./docs/readme.md)"
+referenced_assets = discover_assets(content)
+```
+
+### Asset Metadata and Validation
+
+```python
+from markitect.packaging.asset_utils import AssetUtils
+
+# Create asset metadata with checksum
+metadata = AssetUtils.create_asset_metadata(
+    file_path=Path("image.png"),
+    package_path="assets/image.png"
+)
+
+print(f"Size: {metadata.size} bytes")
+print(f"Checksum: {metadata.checksum}")
+print(f"MIME Type: {metadata.mime_type}")
+
+# Validate asset integrity
+is_valid = AssetUtils.validate_asset_integrity(
+    Path("image.png"),
+    expected_checksum=metadata.checksum
+)
+```
+
+### Path Rewriting
+
+Automatic path rewriting ensures assets work correctly within packages:
+
+```python
+from markitect.packaging.path_utils import PathUtils
+
+content = """
+# My Document
+![Logo](./assets/logo.png)
+[Documentation](./docs/guide.md)
+"""
+
+asset_map = {
+    './assets/logo.png': 'assets/logo.png',
+    './docs/guide.md': 'assets/guide.md'
+}
+
+rewritten = PathUtils.rewrite_asset_paths(content, asset_map)
+# Result: paths updated to package-internal locations
+```
+
+## Integration with Variant System
+
+The packaging system seamlessly integrates with MarkiTect's existing variant architecture:
+
+### Variant Factory Integration
+
+```python
+from markitect.explode_variants import get_variant_factory, ExplodeVariant
+
+factory = get_variant_factory()
+
+# Create MDZ variant
+mdz_variant = factory.create_variant(ExplodeVariant.MDZ)
+
+# Auto-detect package format
+detection_result = factory.detect_variant(Path("document.mdz"))
+print(f"Detected format: {detection_result.variant}")
+```
+
+### CLI Integration
+
+```bash
+# Create MDZ package
+markitect md-package create document.md --format mdz --output document.mdz
+
+# Extract MDZ package
+markitect md-package extract document.mdz --output extracted/
+
+# Process MDT template
+markitect md-transclude process template.mdt --variables config.json
+```
+
+## Error Handling
+
+Comprehensive error handling with specialized exception types:
+
+```python
+from markitect.packaging.errors import (
+    PackagingError, AssetError, TransclusionError,
+    CircularReferenceError, DepthLimitError
+)
+
+try:
+    result = engine.process_file(Path("template.mdt"))
+except CircularReferenceError as e:
+    print(f"Circular reference detected: {e}")
+except DepthLimitError as e:
+    print(f"Inclusion depth exceeded: {e}")
+except AssetError as e:
+    print(f"Asset processing error: {e}")
+```
+
+## Advanced Features
+
+### Circular Reference Detection
+
+The transclusion engine automatically detects and prevents circular references:
+
+```python
+# This will raise CircularReferenceError
+# file1.md: {{include "file2.md"}}
+# file2.md: {{include "file1.md"}}
+
+engine = TransclusionEngine(max_depth=10)
+try:
+    result = engine.process_file(Path("file1.md"))
+except CircularReferenceError as e:
+    print(f"Cycle detected: {e}")
+```
+
+### Depth Limiting
+
+Control inclusion depth to prevent infinite recursion:
+
+```python
+engine = TransclusionEngine(max_depth=5)  # Limit to 5 levels deep
+```
+
+### Cross-Platform Compatibility
+
+Path handling ensures compatibility across operating systems:
+
+```python
+from markitect.packaging.path_utils import PathUtils
+
+# Handles Windows, macOS, and Linux path conventions automatically
+normalized = PathUtils.normalize_path("./assets\\image.png")
+# Result: "./assets/image.png" (normalized to POSIX format)
+```
+
+## Performance Considerations
+
+### Asset Processing
+
+- **Lazy Loading**: Assets are processed only when needed
+- **Checksum Caching**: Asset checksums are cached for performance
+- **Compression**: ZIP compression reduces package size
+
+### Memory Usage
+
+- **Streaming Processing**: Large files are processed in chunks
+- **Context Management**: Transclusion contexts are properly cleaned up
+- **Resource Cleanup**: File handles and temporary files are automatically cleaned
+
+## Best Practices
+
+### Package Organization
+
+```markdown
+project/
+├── content.md          # Main content
+├── assets/             # All assets in dedicated directory
+│   ├── images/
+│   ├── stylesheets/
+│   └── documents/
+├── templates/          # Transclusion templates
+│   ├── header.md
+│   ├── footer.md
+│   └── sections/
+└── variables.json      # Template variables
+```
+
+### Asset Management
+
+1. **Use relative paths** in markdown content
+2. **Organize assets** in dedicated directories
+3. **Validate checksums** for integrity verification
+4. **Optimize file sizes** before packaging
+
+### Transclusion Templates
+
+1. **Keep templates focused** on single concerns
+2. **Use meaningful variable names**
+3. **Document template requirements**
+4. **Test with various variable combinations**
+
+## Migration Guide
+
+### From Legacy Exploded Structures
+
+Existing exploded structures can be migrated to packaging formats:
+
+```python
+# Convert exploded directory to MDZ package
+from markitect.packaging.mdz_variant import MdzVariant
+
+mdz = MdzVariant()
+result = mdz.create_package(
+    source_path=Path("document.mdd/"),  # Existing exploded directory
+    options={'output_path': Path("document.mdz")}
+)
+```
+
+### From Traditional Markdown
+
+```python
+# Package existing markdown with assets
+result = mdz.create_package(
+    source_path=Path("README.md"),
+    options={
+        'output_path': Path("README.mdz"),
+        'include_assets': True  # Auto-discover and include assets
+    }
+)
+```
+
+## API Reference
+
+### Core Classes
+
+- **`PackagingVariant`**: Abstract base class for packaging variants
+- **`MdzVariant`**: MDZ format implementation
+- **`TransclusionEngine`**: Template processing engine
+- **`TransclusionContext`**: Processing context with variable management
+- **`DirectiveParser`**: Parses transclusion directives
+
+### Utility Classes
+
+- **`AssetUtils`**: Asset discovery and metadata management
+- **`PathUtils`**: Path rewriting and normalization
+- **`PackageMetadata`**: Package metadata representation
+- **`AssetMetadata`**: Individual asset metadata
+
+### Error Types
+
+- **`PackagingError`**: Base packaging exception
+- **`PackageFormatError`**: Package format issues
+- **`AssetError`**: Asset handling problems
+- **`TransclusionError`**: Transclusion processing errors
+- **`CircularReferenceError`**: Circular inclusion detection
+- **`DepthLimitError`**: Inclusion depth exceeded
+
+---
+
+**Implementation Status**: ✅ **Complete** (Issue #150)
+**Test Coverage**: 53/53 tests passing (100%)
+**Documentation**: Comprehensive API and usage documentation
+**Integration**: Full integration with existing variant system