feat(mem-wal): add ShardWriter::abort + Sealed manifest fence for drop-table#7361

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hamersaw:feature/wal-drop-table

Commits on Jun 18, 2026

feat(mem-wal): ShardWriter::abort and Session::invalidate_dataset for drop-table

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Commits on Jun 23, 2026

style(mem-wal): use Self in ShardStatus i32 conversions

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style(mem-wal): collapse sealed-shard check into a let-chain

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