CUBELinux-2
308e20852c
- Session gains txn: Option<Txn> (BEGIN snapshot + buffered ops) and identity: Option<TenantIdentity> (owner enforcement hook for Tasks 6+). - prog/write/del buffer into the open txn; commit_txn applies the whole batch under one write lock + a SINGLE WalOp::Txn entry (atomic + durable replay). ROLLBACK discards. Reads consult the BEGIN snapshot (isolation). - cube-server: HELLO-resolved tenant yields Some(ts); default-tenant path consistent; Session built once per connection so txns span frames. - WalEntry gains batch field; decode_wal + encode_wal handle Txn replay. - 4 new T5 tests: buffer/commit, rollback, snapshot isolation, durable reopen via WAL replay. ./check quick green.