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bench: add optional CP-SAT reference

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Provide a separately installed OR-Tools model to compare a generic constraint solver with the native first-solution path without adding a production or default-test dependency.

Use no-overlap, exact-fill, edge and equal-copy symmetry constraints, validate placements independently, and record model size, memory, worker count and timings for orders 8 and 9. Keep the tool only as a reference and defer DLX absent new evidence.

Tests: Release CTest (9 passed)

Tests: Python reference tests and compilation checks

Tests: independently validated CP-SAT orders 8 and 9

Refs: #5
This commit was merged in pull request #22.
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2026-07-30 17:40:17 +01:00
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README.md
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@@ -66,3 +66,7 @@ instructions.
Performance measurements use the separate opt-in suite described in
[BENCHMARKING.md](./BENCHMARKING.md).
The research-only OR-Tools comparison is optional and documented in
[CP_SAT_REFERENCE.md](./CP_SAT_REFERENCE.md). It does not affect the native
build or its dependencies.