Document remote-helper scheme support
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Add a "Remote-helper schemes" section to docs/usage.md and a README FAQ entry explaining that git-sync falls back to git-remote-<scheme> for non-native URL schemes, with entire:// as the motivating example, and noting the --stats throughput caveat shared with SSH.
Co-Authored-By: Claude Opus 4.8 (1M context) noreply@anthropic.com Entire-Checkpoint: 91460e76a6df
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❯ GITSYNC_MAX_REF_UPDATES_PER_PUSH=5000 go run ./cmd/git-sync replicate --all-refs --stats --verbose \
Claude CodeOpus 4.8[1m]
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