refactor: gate debug tracer modules behind #[cfg(test)]#2486
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The five debug_*.rs modules (debug_del, debug_recv, debug_send, debug_deltasum, debug_flist) totalling 3,678 lines have zero production callers — they are only exercised by their own internal unit tests. Gating them behind #[cfg(test)] eliminates ~100KB of dead code from release binaries while keeping the tests functional.
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Summary
#[cfg(test)]— they have zero production callersdebug_del,debug_recv,debug_send,debug_deltasum,debug_flist(3,678 lines total)Test plan
cargo check -p engine --all-targets --all-featurespassescargo clippy -p engine --all-targets --all-features --no-depsclean