Re-enable `benchmarks.rs` for the Atomic Swap contract

[fejilaup-cloud]

Labels: bug, atomic-swap, testing
Priority: Medium
Estimated Time: 2 hours

Description:
contracts/atomic_swap/src/lib.rs has // #[cfg(test)] mod benchmarks; commented out behind a "pre-existing compile errors from merge conflict" note, alongside mutation_tests, snapshot_tests, and upgrade_chaos_tests — none of these currently run.

Tasks:

• Fix compile errors in benchmarks.rs
• Re-enable the module
• Confirm cargo test -p atomic-swap still passes
• Track gas/CPU regressions for initiate_swap, accept_swap, reveal_key

[olaams-tech]

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Hi i would like to work on this issue please assign to me
I can do it perfectly

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[Michvista]

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Please assign this issue to me

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[villadel]

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I would like to work on this issue!

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[grantfox-oss]

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@villadel's PR #943 was approved and merged by @fejilaup-cloud.

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