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Issue: Durability and persistence bugs in transaction commits

Issue: Durability and persistence bugs in transaction commits: a task in LegoFlow-SWE (Harbor dataset). Expected: - begin write() → set durability(Durability::None) → write → commit() succeeds - a subsequent begin write() → commit() also succeeds

The task

**Expected:** - `begin_write()` → `set_durability(Durability::None)` → write → `commit()` succeeds - a subsequent `begin_write()` → `commit()` also succeeds

Part of Lego-X/LegoFlow-SWE.