[DecisionNerd]

Summary

• Capture one rollback checkpoint at the owning transaction boundary and reuse it across staged Cypher statements.
• Let inner statement lifecycles defer rollback to the transaction owner while preserving successful statement refreshes and read-your-writes behavior.
• Add real facade work counters for checkpoint captures, source and copied bytes, files, and flushes, plus a later-statement failure/reopen regression.

Validation

• Refreshed onto origin/main f89e7d9dc02b4ee768424540779a9b18408d1308; final head 6b11d8a5f051bf2062e2164d12118daebffb66de.
• TMPDIR=/home/ubuntu/.cache/gf-1807-tmp CARGO_TARGET_DIR=/tmp/gf-1807-checkpoint cargo test -p graphforge-api --test transaction_checkpoint_cost -- --nocapture — 2 passed.
• TMPDIR=/home/ubuntu/.cache/gf-1807-tmp CARGO_TARGET_DIR=/tmp/gf-1807-checkpoint CARGO_BUILD_JOBS=2 make check — passed.
• Post-refresh capture, source/copy-byte, file and flush results are recorded on the issue: perf(api): remove per-statement whole-workspace transaction backups #1807 (comment).
  Closes perf(api): remove per-statement whole-workspace transaction backups #1807.

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