chore: remove unused RecordBatch and RecordBatcher

[detail-app]

Removes storage/src/record/batcher.rs and its re-export from
storage/src/record/mod.rs.

RecordBatch and RecordBatcher had no production callers anywhere in
the codebase. They were re-exported from s2-storage but never imported
or used by s2-lite (the only dependent crate) or any other crate. Their
only consumers were the #[cfg(test)] module within batcher.rs itself.

History

• Last materially changed April 2026 (feat: request-time data encryption #349 @infiniteregrets)

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[greptile-apps]

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