ci: add benchmark regression check for PRs#119
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Run bench-incremental on both the base branch and the PR head within the same CI runner so wall-clock comparisons are fair. A Python comparison script flags two classes of regression: 1. Derivation-count increase (deterministic, any delta is a failure). 2. Wall-clock time increase above a configurable threshold (default 20%). Results are posted as a PR comment and the check hard-fails on regression. Also wires ruff-check and ruff-format into treefmt so Python files are linted as part of `nix fmt`.
Add --stderr-tail flag (default 500) to control how many bytes of stderr are kept in error messages. CI passes 4000 so local store build failures produce actionable diagnostics instead of truncated cascading-dependency messages.
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Benchmark Regression Check
Baseline: |
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Run bench-incremental on both the base branch and the PR head within the same CI runner so wall-clock comparisons are fair. A Python comparison script flags two classes of regression:
Results are posted as a PR comment and the check hard-fails on regression.
Also wires ruff-check and ruff-format into treefmt so Python files are linted as part of
nix fmt.