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Replace serial getManifestSize() calls 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) 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 closes #8