63a3021094
Add 4 regression tests covering the pre-set effort path: - pre-set effort=max + variant=max + github-copilot Opus -> clamped to high - pre-set effort=max + variant=high + github-copilot Opus -> clamped to high (cubic violation case from PR #3608) - pre-set effort=max + non-constrained Opus -> max preserved (no regression) - pre-set effort=high + github-copilot Opus -> high preserved (don't overwrite valid pre-set) Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>