* test: add engine generation tests for expected invariants
- test_seed_reproducibility
- test_temperature_zero_determinism
- test_max_tokens_respected
- test_num_samples_count
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
* Fix temperature test
* add test for seed variation in sampling
Add test for seed variation in sampling with temperature > 0.
* Rename test for clarity
* Shorten assert msg
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Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: Sofie Van Landeghem <svlandeg@users.noreply.github.com>
