Use blob:none partial fetch when syncing metadata branch

[jcleira]

Description

When fetching the remote metadata/checkpoint branch during push recovery or sync operations, use git fetch --filter=blob:none to skip downloading blob objects. Only the tree structure is needed to merge checkpoint entries — blobs are either already local or fetched on demand.

Why

Checkpoint metadata branches can accumulate large blobs over time. Fetching only the tree during sync reduces bandwidth and latency, making push recovery and metadata merges significantly faster especially in repos with long history.

Source

• Origin: Use partial fetch (blob:none) for checkpoints metadata entireio/cli#712
• Detected from: entireio-cli-pulls

Target Repos

• cli

Acceptance Criteria

• Fetch of the remote metadata branch uses --filter=blob:none
• Merge of remote and local checkpoint entries succeeds using only tree structure
• No regression in checkpoint data integrity after merge
• Reduced network transfer is observable when syncing against a remote with existing checkpoint history

Context Hints

• cli/internal/sync/
• cli/internal/checkpoint/
• cli/internal/git/

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[jcleira]

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PRs created:

• [minion] Use blob:none partial fetch when syncing metadata branch cli#19