Update ADR-003 implementation diagram to include tar file loading and local registry features

[Copilot]

Summary

Updated the implementation diagram in adr-003-docker-image-download.md to accurately reflect the current implementation status by adding two implemented features that were missing from the visual representation.

Changes Made

The mermaid diagram now includes:

• H[Load Images from .tar Files]:::implemented - Connected from A[Simulated Fetching Logic]
• I[Local Registry Downloads]:::implemented - Connected from B[Registry Interface Implementation]

Implementation Status Verification

Both features are fully implemented in the codebase:

1. Load Images from .tar Files ✅

• Implementation: LoadImageFromTar() function in image.go
• CLI Command: ./basic-docker load <tar-file-path>
• Usage Example:

  ./basic-docker load alpine.tar
  ./basic-docker images  # Shows loaded image

2. Local Registry Downloads ✅

• Implementation: Registry URL parsing in run() function
• Supports: Custom registry formats like localhost:5000/alpine
• Usage Example:

  ./basic-docker run localhost:5000/alpine /bin/sh -c "echo Hello"

Updated Diagram

The diagram now accurately shows the implementation roadmap:

Legend:

• 🟢 Green: Implemented features
• 🟡 Yellow: In progress
• 🔴 Red: Not started

Impact

• Zero code changes - Documentation update only
• All tests pass (9/9)
• Application builds successfully
• Better visibility into project's actual implementation status vs. planned features

This change addresses the gap between what was implemented and what was documented, providing stakeholders with an accurate view of the current capabilities.

This pull request was created as a result of the following prompt from Copilot chat.

Update the implementation diagram in adr-003-docker-image-download.md to explicitly include and label both 'Load Images from .tar Files' and 'Local Registry Downloads' as implemented features. These should appear as nodes in the diagram with clear connections from the relevant parts of the existing process (e.g., 'Simulated Fetching Logic' and 'Registry Interface Implementation'). Use the following revised mermaid diagram as a guide:

graph TD
    A[Simulated Fetching Logic]:::implemented --> B[Registry Interface Implementation]:::implemented
    A --> H[Load Images from .tar Files]:::implemented
    B --> I[Local Registry Downloads]:::implemented
    B --> C[Layer Downloading]:::inprogress
    C --> D[Full Registry Authentication]:::notstarted
    D --> E[Layer Verification]:::notstarted
    E --> F[Layer Extraction]:::notstarted
    F --> G[Root Filesystem Creation]:::notstarted

    %% Styles
    classDef implemented fill:#a8d08d,stroke:#000,stroke-width:2px;
    classDef inprogress fill:#ffe699,stroke:#000,stroke-width:2px;
    classDef notstarted fill:#f4cccc,stroke:#000,stroke-width:2px;

Loading

Replace the existing diagram in adr-003-docker-image-download.md (main branch) with this updated diagram and ensure the diagram matches the current implementation status as described.

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