Local build optimization

Measure local wall time before changing. Preserve checks, artifacts, and failure behavior.

This skill covers local cargo, pytest, npm, pnpm, go, and just commands. Use /ci-optimize for GitHub Actions workflow timing or changes.

Discipline

Iron Law: Measure the approved run plan before proposing a concrete edit.

Red Flags — stop when you notice these:

1. An edit removes a check or artifact, changes the workload, or hides a failure.
2. Cache operations, sample counts, warmups, or isolation differ from the approved plan.
3. Cold and warm cohorts merge, or a blocked helper comparison becomes a speed claim.