RULES.md gains "The machine you build on": check memory, load and running
builds first, cap Cargo jobs and test threads, run at low priority, one heavy
job at a time, stop when the person says the machine is slow, and clean up
scratch targets. Locally only the test targets a change touches run; the full
suite runs on GitHub before a release. AGENTS.md, CONTRIBUTING.md and the PR
checklist say the same.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Marcos Paulo