fix: safe i32-to-usize casts in AO sampling#2
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Add coord_as_usize() helper that returns Option<usize> for bounds-checked coordinate conversion. Refactor sample_block_opaque() to use it, making i32→usize casts explicitly safe.
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Summary
coord_as_usize()helper for bounds-checked i32→usize conversionsample_block_opaque()to use it, making all casts explicitly safeTest plan
cargo test(72/72 pass)cargo clippy --all-targets -- -D warningscargo fmt --all -- --check