Benchmark Solana SBF compute-unit usage across Rust math libraries.

Each math library is tested in its own crate under crates/ so generated svm-unit-test programs only depend on the library being measured.

• fixed
• rust-decimal
• hylo-fix
• spl-math

Run all workspace tests:

just test

Run one library and print only CU readings:

just fixed
just rust-decimal
just hylo-fix
just spl-math

Compare libraries:

just compare fixed rust-decimal hylo-fix spl-math

Or compare between all libraries:

just compare-all

Save comparison output as CSV:

just compare-save fixed rust-decimal hylo-fix spl-math

Compare and save output of all libraries:

just compare-save-all

Most library crates use upstream svm-unit-test. hylo-fix and spl-math use the local svm-unit-test-std wrapper because their generated SBF tests pull in std, which conflicts with the upstream no-std panic handler.

See CONTRIBUTING.md.