docs: add comprehensive INTRODUCTION.md

Provides high-level overview of MarkiTect from value and functional perspective:
- What MarkiTect is and why it matters
- Core capabilities (Information Spaces, Schema Management, etc.)
- Practical use cases across different domains
- Key benefits for different user types
- Getting started guidance
- Philosophy and design principles

Focuses on user value and functionality without implementation details.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

INTRODUCTION.md

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+# MarkiTect: Intelligent Markdown as Structured Information
+
+## What is MarkiTect?
+
+MarkiTect transforms how you work with markdown by treating documents as **structured, queryable information spaces** rather than plain text files. It's a comprehensive system for managing, validating, transforming, and composing markdown documents at scale—whether you're maintaining technical documentation, building knowledge bases, generating reports, or orchestrating complex document workflows.
+
+Think of MarkiTect as a **database for your markdown content**, combined with powerful tools for ensuring consistency, automating repetitive tasks, and creating intelligent document systems that adapt to your needs.
+
+## Why MarkiTect Matters
+
+### The Problem
+
+Modern documentation and content workflows face several challenges:
+
+- **Inconsistency**: Different documents follow different structures, making content hard to maintain and process
+- **Manual Validation**: No automated way to ensure documents meet quality standards or required formats
+- **Content Silos**: Documents exist in isolation without relationships or shared context
+- **Repetitive Work**: Copy-pasting boilerplate, manually updating cross-references, regenerating similar documents
+- **Limited Automation**: Plain markdown files can't drive automated workflows or integrate with systems
+- **Scaling Difficulties**: Managing hundreds or thousands of documents becomes overwhelming
+
+### The MarkiTect Solution
+
+MarkiTect solves these problems by treating markdown as **structured data**:
+
+- **Schema-Driven**: Define document structures once, validate everywhere
+- **Relational**: Documents can reference, include, and compose with each other
+- **Queryable**: Extract insights from your content using powerful queries
+- **Automated**: Generate, validate, and transform documents programmatically
+- **Versioned**: Track changes and maintain document history
+- **Composable**: Build complex documents from reusable components
+
+## Core Capabilities
+
+### 1. Information Spaces
+
+Create **organized collections of related documents** that work together as cohesive knowledge spaces:
+
+- **Structured Collections**: Group documents by project, topic, or any logical structure
+- **Transclusion**: Embed content from one document into another, maintaining a single source of truth
+- **Shared Context**: Variables and configuration shared across all documents in a space
+- **Multiple Views**: Render the same content as HTML, export to directories, or query programmatically
+- **Hierarchical Organization**: Parent-child relationships for inherited settings and permissions
+
+### 2. Schema Management
+
+Define and enforce document structures to ensure consistency:
+
+- **Schema Generation**: Automatically extract schemas from example documents
+- **Validation**: Verify documents match required structures before publishing
+- **Schema Evolution**: Track how document requirements change over time
+- **Template Generation**: Create document stubs from schemas
+- **Semantic Understanding**: Schemas capture both structure and meaning
+
+### 3. Document Processing
+
+Powerful tools for analyzing, transforming, and manipulating content:
+
+- **Intelligent Parsing**: Understand document structure including frontmatter, content, and metadata
+- **Content Extraction**: Pull specific sections, metadata, or elements from documents
+- **Transformation**: Convert between formats while preserving semantic meaning
+- **Batch Operations**: Process multiple documents with a single command
+- **Quality Checks**: Automated validation of links, references, and formatting
+
+### 4. Transclusion & Composition
+
+Build complex documents from reusable components:
+
+- **Content Reuse**: Include shared sections across multiple documents
+- **Variable Substitution**: Parameterize content for different contexts
+- **Conditional Content**: Show or hide sections based on conditions
+- **Variant Generation**: Create multiple versions from a single source
+- **Cross-Document References**: Maintain relationships between related content
+
+### 5. Querying & Analysis
+
+Extract insights from your documentation:
+
+- **Metadata Queries**: Find documents by attributes, tags, or properties
+- **Content Search**: Locate specific information across your entire corpus
+- **Relationship Mapping**: Understand how documents connect and depend on each other
+- **Statistics**: Analyze document sizes, structures, and patterns
+- **Reporting**: Generate summaries and reports from your content
+
+### 6. Automation & Integration
+
+Connect markdown content to broader workflows:
+
+- **CLI Interface**: Automate any operation from scripts or CI/CD pipelines
+- **GraphQL API**: Query and manipulate spaces programmatically
+- **Event System**: React to document changes in real-time
+- **Plugin Architecture**: Extend functionality for specific needs
+- **Git Integration**: Optional version control for complete change history
+
+## Use Cases
+
+### Technical Documentation
+
+**Challenge**: Maintain consistent API documentation across multiple services
+**Solution**: Use schemas to enforce standard formats, transclusion for shared examples, and variables for service-specific details
+
+**Benefits**:
+- One source of truth for common patterns
+- Automatic validation of all documentation
+- Generate client libraries and API specs from the same source
+- Track documentation changes alongside code
+
+### Knowledge Management
+
+**Challenge**: Organize company knowledge across departments and projects
+**Solution**: Create information spaces for each domain, use cross-document references for relationships, enable search across all content
+
+**Benefits**:
+- Discoverable knowledge base
+- Consistent structure across departments
+- Track what content exists and how it connects
+- Generate reports on documentation coverage
+
+### Report Generation
+
+**Challenge**: Create hundreds of similar reports with varying data
+**Solution**: Define report schemas, use templates with variables, batch-generate reports from data sources
+
+**Benefits**:
+- Consistent report structure
+- Automated generation from data
+- Quality validation before distribution
+- Version tracking for compliance
+
+### Content Publishing
+
+**Challenge**: Maintain a blog or publication with consistent formatting
+**Solution**: Use schemas for post structures, transclusion for common elements, render to HTML with themes
+
+**Benefits**:
+- Enforced style guide compliance
+- Reusable components (author bios, disclaimers, CTAs)
+- Multiple output formats from single source
+- Automated link checking and validation
+
+### Educational Materials
+
+**Challenge**: Create course materials with exercises, examples, and assessments
+**Solution**: Schema-driven lesson structures, transclusion for common instructions, variable content for different audiences
+
+**Benefits**:
+- Consistent lesson structure
+- Easy updates across multiple courses
+- Generate student and instructor versions
+- Track curriculum evolution
+
+### Compliance Documentation
+
+**Challenge**: Maintain audit trails and ensure required document elements
+**Solution**: Strict schemas with validation, versioned spaces with history tracking, automated compliance reports
+
+**Benefits**:
+- Guaranteed document completeness
+- Audit trail for all changes
+- Automated compliance checking
+- Generate reports for auditors
+
+## Key Benefits
+
+### For Writers and Content Creators
+
+- **Focus on Content**: Let MarkiTect handle structure and consistency
+- **Reuse Work**: Write once, use everywhere with transclusion
+- **Quality Assurance**: Automated validation catches errors early
+- **Easy Updates**: Change once, propagate everywhere
+- **Version Control**: Track all changes with git integration
+
+### For Teams and Organizations
+
+- **Consistency at Scale**: Same structure across thousands of documents
+- **Collaboration**: Shared spaces with inheritance and permissions
+- **Automation**: Reduce manual work through scripting
+- **Integration**: Connect documentation to development workflows
+- **Maintainability**: Clear structure makes updates easier
+
+### For Developers and Automators
+
+- **Programmatic Access**: CLI and GraphQL APIs for automation
+- **Event-Driven**: React to changes in real-time
+- **Extensible**: Plugin system for custom functionality
+- **Type-Safe**: Schemas provide structure for reliable automation
+- **Performance**: Intelligent caching for fast operations
+
+### For Organizations
+
+- **Reduced Costs**: Automation reduces manual documentation work
+- **Higher Quality**: Validation ensures consistency and completeness
+- **Better Governance**: Track changes, enforce standards, maintain compliance
+- **Improved Discovery**: Query and search across all content
+- **Future-Proof**: Markdown is open, portable, and sustainable
+
+## Getting Started
+
+MarkiTect works with your existing markdown files. Start small:
+
+1. **Process a document**: Ingest a markdown file to see its structure
+2. **Generate a schema**: Extract patterns from your existing content
+3. **Validate consistency**: Check if other documents match the pattern
+4. **Create a space**: Group related documents together
+5. **Explore capabilities**: Try transclusion, rendering, or querying
+
+No migration required—MarkiTect enhances your workflow without replacing your tools.
+
+## Who Should Use MarkiTect?
+
+**MarkiTect is ideal for**:
+- Technical writers maintaining large documentation sets
+- Documentation teams standardizing content across projects
+- Content operations teams automating publishing workflows
+- Knowledge managers organizing institutional information
+- Developers integrating documentation into CI/CD
+- Publishers creating structured content from markdown
+
+**MarkiTect might not be right if**:
+- You only work with a handful of simple documents
+- You don't need consistency or validation
+- Your content has no structure or patterns
+- You prefer visual editors over text-based workflows
+
+## Philosophy
+
+MarkiTect is built on these principles:
+
+**Markdown is Data**: Documents contain structured information that can be processed, queried, and transformed
+
+**Convention Over Configuration**: Sensible defaults that work out of the box, customize only when needed
+
+**Schema-Driven Quality**: Define structures once, enforce them everywhere
+
+**Composability**: Build complex systems from simple, reusable components
+
+**Performance Matters**: Fast operations that scale to thousands of documents
+
+**Open and Portable**: Pure markdown files that work with any tool
+
+## What's Next?
+
+This introduction provides a high-level overview of MarkiTect's value and capabilities. To dive deeper:
+
+- **[CLI Tutorial](docs/CLI_TUTORIAL.md)**: Learn practical commands and workflows
+- **[Schema Management Guide](docs/SCHEMA_MANAGEMENT_GUIDE.md)**: Master document validation
+- **[Asset Management](docs/ASSET_MANAGEMENT_USER_GUIDE.md)**: Work with images and resources
+- **[Plugin System](docs/PLUGIN_SYSTEM.md)**: Extend MarkiTect for your needs
+- **[Project Structure](docs/PROJECT_STRUCTURE.md)**: Understand how it's organized
+
+---
+
+*MarkiTect transforms markdown from simple text files into intelligent, structured information spaces that power modern documentation and content workflows.*