refactor(compare): split workload into a reusable module
Moves the problem definitions, the ~88 algorithm runners, and the table-printing presentation out of examples/compare.rs into examples/_shared/compare_workload.rs (path-included as `mod workload`). examples/compare.rs is now a thin shim that calls `workload::run_all()`. This makes the exact `compare` workload reusable: an upcoming gungraun profiling benchmark (benches/compare_profile.rs) path-includes the same module and drives the runner functions directly, so it exercises identical code with no duplication. `examples/_shared/` has no `main.rs`, so cargo does not auto-discover it as an example. Pure reorganization: `cargo run --release --example compare` produces identical output (every quality metric, front size, and row order unchanged; only the non-deterministic wall-clock `ms` column jitters). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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