Add comprehensive project documentation

[Copilot]

Documentation Enhancement Plan

• Create ARCHITECTURE.md - Document the project architecture and design with Mermaid diagram
• Create CODE_OF_CONDUCT.md - Add community code of conduct (Contributor Covenant 2.1)
• Create CONTRIBUTING.md - Add contribution guidelines and development setup
• Create SECURITY.md - Add security policy and vulnerability reporting
• Update README.md - Clean up and improve with feature list, better usage info, and proper structure
• Update AGENTS.md - Reference the new documentation files
• Update .cspell.json - Add new words from the documentation
• Validate all markdown files with linting and spell checking
• Address code review feedback - Complete project structure and WASM clarification
• Convert features table to bullet list with icons

Original prompt

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This section details on the original issue you should resolve

<issue_title>[Feature]: Enhance Project Documentation</issue_title>
<issue_description>### 🎯 Problem Statement

The project is lacking common documentation.

💡 Proposed Solution

Add the following standard documents:

• ARCHITECTURE.md
• CODE_OF_CONDUCT.md
• CONTRIBUTING.md
• SECURITY.md

The README.md file should be cleaned up and improved with a suitable feature table, usage information, and appropriate references.

The AGENTS.md should be updated to reference appropriate files.

🔄 Alternatives Considered

N/A

📝 Additional Context

N/A

🤝 Contribution

• I would be willing to implement this feature</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [Feature]: Enhance Project Documentation #15

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💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

[Malcolmnixon]

Let's just have this as a bullet-list with icons rather than a table.

[Copilot]

Changed to icon-based bullet list in commit 620b940.