feat: Git history preservation (full clone)

[Snider]

Summary

Preserve complete Git history, not just latest state.

Use Case

When archiving repos, need full history for forensics and blame analysis.

Current Behaviour

borg collect github repo clones but may not preserve complete history.

Proposed Enhancement

# Full history (default)
borg collect github repo https://github.com/org/repo --full-history

# Shallow (faster, less storage)
borg collect github repo https://github.com/org/repo --depth 1

# Include all branches
borg collect github repo https://github.com/org/repo --all-branches

# Include all tags
borg collect github repo https://github.org/repo --all-tags

Data Preserved

• All commits on all branches
• All tags (annotated and lightweight)
• Reflogs (optional)
• Git LFS objects
• Submodules (recursive)

Options

Flag	Description
--full-history	Complete git history (default)
--depth N	Shallow clone
--all-branches	All remote branches
--all-tags	All tags
--lfs	Include LFS objects
--submodules	Recursive submodule clone

Acceptance Criteria

• Full history by default
• All branches option
• All tags option
• LFS support
• Submodule handling

[google-labs-jules]

Jules is on it. When finished, you will see another comment and be able to review a PR.

[google-labs-jules]

Ready for a review! A PR has been created.