Port SWEfficiency benchmark to Harbor

[neubig]

Context

benchmarks/swefficiency does not appear to have a corresponding Harbor registry dataset/adapter yet. It has resource-sensitive Docker behavior and performance-oriented verification, so it should be ported deliberately with parity checks.

Proposed scope

• Create a Harbor adapter/dataset for SWEfficiency tasks.
• Preserve CPU/memory/resource assumptions and performance scoring semantics.
• Validate Oracle/reference behavior where available.
• Compare current OpenHands harness results against Harbor runs.

Acceptance criteria

• SWEfficiency tasks can be run through Harbor with appropriate resource controls.
• Performance/verifier parity is documented.
• The OpenHands wrapper can delegate SWEfficiency execution to Harbor.