[02] Reference-aware GC for v2/ blobs + gzip the manifest - #20
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List v2/ objects, subtract the current manifest's references and objects younger than a 48h grace window, and delete the remainder in batches. Exposed as a data-router endpoint (grace_hours and dry_run params) so a scheduler can trigger it. Legacy paths, hist/, and manifest.json are never touched.
manifest.json is refetched per client each minute and is the dominant egress cost. Store it gzipped with Content-Encoding: gzip; GCS transcoding serves it compressed to browsers (which send Accept-Encoding: gzip) and transparently decompressed otherwise, so no reader change is needed.
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Replacement for #7 (auto-closed by branch rename). Part of the cph-staging series.