Document Final Architecture from Miro in `docs/`

[jdsika]

Objective:
Transfer the final architecture descriptions from Miro to structured Markdown documentation in the docs/ folder. Ensure all implemented components, workflows, and interactions are clearly documented.

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Tasks:

1. Review Miro Board:

   • Identify all finalized architecture diagrams, components, and workflows.
   • Note key details: smart contracts, services (Issuer/Verifier), DIDs, and data flows.

2. Create/Update Documentation:

   • Add or update Markdown files in docs/ to reflect the Miro content. Example structure:

     docs/
     ├── architecture/
     │   ├── overview.md          # High-level architecture
     │   ├── issuer-service.md   # Issuer component details
     │   ├── verifier-service.md  # Verifier component details
     │   ├── registry-contracts.md # Smart contract interactions
     │   └── data-flow.md         # Cross-component workflows
     

3. Include Visuals:

   • Export relevant Miro diagrams as images (PNG/SVG) and embed them in the Markdown files.
   • Example:

     ![Architecture Overview](images/architecture-overview.png)

4. Verify Accuracy:

   • Cross-check documentation with the Miro board and implemented codebase.
   • Assign a team member to review for completeness.

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Acceptance Criteria:
✅ Final architecture from Miro is fully documented in docs/ with clear, structured Markdown.
✅ Diagrams are embedded, and all components/workflows are described.
✅ Documentation is reviewed and approved by at least one team member.

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Notes:

• Focus on implemented features/components only.
• Use concise language and bullet points for clarity.