docs: Add agentic workflows and development guide documentation

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Summary

This PR adds comprehensive documentation for GitHub Agentic Workflows and development processes, addressing documentation gaps identified in docs/TODO.md.

Changes

New Documentation

1. docs/agentic-workflows.md - Complete guide to the repository's autonomous AI-powered workflows:

   • Overview of Update Docs, Weekly Research, and Daily Test Improver workflows
   • Security considerations including XPIA protection
   • Configuration, compilation, and monitoring instructions
   • Best practices and troubleshooting guidance

2. docs/development.md - Comprehensive development guide for contributors:

   • Prerequisites and environment setup instructions
   • Building from source (debug and release)
   • Complete test running guide (unit, integration, E2E)
   • Debugging workflows with MCP Inspector, logging, and debuggers
   • Code style standards (formatting, linting, copyright headers)
   • Contributing guidelines and development process

Updated Files

3. docs/SUMMARY.md - Enhanced navigation structure:

   • Added new "Development" section with language-specific component guides
   • Added new "Repository Automation" section for workflow documentation
   • Improved organization for better discoverability

4. CHANGELOG.md - Updated following Keep a Changelog format:

   • Added entries for new documentation in [Unreleased] section

Benefits

• For New Contributors: Clear entry point with step-by-step setup and contribution instructions
• For Maintainers: Documented autonomous workflows reduce manual maintenance burden
• For Users: Better understanding of repository automation and quality processes
• For Security: Explicit XPIA protection documentation for all workflows

Documentation Quality

• Follows Diátaxis framework (tutorials, how-to guides, technical reference, explanation)
• Uses progressive disclosure (high-level concepts first, detailed examples second)
• Active voice and developer-friendly tone
• Comprehensive cross-references and navigation
• Searchable and accessible content structure

Testing

• ✅ All markdown files validated for syntax
• ✅ Internal links verified
• ✅ Code examples checked for accuracy
• ✅ Navigation structure tested

Related Issues

Addresses documentation gaps mentioned in docs/TODO.md:

• ✅ Development Setup Guide
• ✅ Comprehensive automation documentation
• ✅ Clear navigation hierarchy
• ✅ Step-by-step contributor guidance

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