clawbot dcf3ec399a feat: concurrent manifest downloads in ListSnapshots (#50) ...

## Summary

Replace serial `getManifestSize()` calls in `ListSnapshots` with bounded concurrent downloads using `errgroup`. For each remote snapshot not in the local DB, manifest downloads now run in parallel (up to 10 concurrent goroutines) instead of one at a time.

## Changes

- Use `errgroup` with `SetLimit(10)` for bounded concurrency
- Collect remote-only snapshot IDs first, pre-add entries with zero size
- Download manifests concurrently, patch sizes from results
- Remove now-unused `getManifestSize` helper (logic inlined into goroutines)
- Promote `golang.org/x/sync` from indirect to direct dependency

## Testing

- `make check` passes (fmt-check, lint, tests)
- `docker build .` passes

closes #8

Co-authored-by: user <user@Mac.lan guest wan>
Reviewed-on: #50
Co-authored-by: clawbot <clawbot@noreply.example.org>
Co-committed-by: clawbot <clawbot@noreply.example.org>

2026-03-22 00:41:39 +01:00

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