Benchmark recombination scaling

[sylvesterkaczmarek]

PR Type

• Tests
• Performance monitoring

Description

Closes #811.

Add recombination cases to the existing performance runner. The cases exercise Caratheodory and tree recombination as the polynomial test-function system grows from 19 to 34 functions, and exercise tree reduction factors 2 and 4.

This keeps recombination separate from explicit-size solver comparisons while recording the scaling axes suggested in the original review discussion.

How Has This Been Tested?

• 8 focused regression tests passed.
• Full unit suite: 1,748 passed, 19 skipped.
• All five performance cases completed a one-run JIT compilation/execution smoke test.
• Pre-commit checks passed, including Ruff and Pyright.
• Pylint score: 10.00/10.
• Sphinx documentation build passed with -n -W under Python 3.14.

Does this PR introduce a breaking change?

No. Production solver behaviour and public APIs are unchanged.