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Chris Lu
bcef462b6c
Adds dailyrun.WalkBuckets — the composable driver the handler-side WalkerFunc will call. Iterates a bucket list, wraps the supplied bootstrap.ListFunc with a per-shard filter (Path for non-MPU, DestKey for MPU init), and runs bootstrap.Walk per bucket using the supplied Dispatcher. First bucket error wins; remaining buckets log and run to completion so one filer flake doesn't kill the shard. Composable rather than monolithic so callers and tests can swap parts: production uses a filer-backed ListFunc + WalkerDispatcher; tests use bootstrap.EntryCallback + a stub. The filer-backed ListFunc is the next commit. Tests pin: shard filter routes only matching entries, MPU shard uses DestKey not the .uploads/<id> path, single-bucket error propagates while other buckets still run, ctx cancellation short-circuits between buckets, nil guards on view/list/dispatch.