Effect testing with @effect/vitest (fresh real layers per test, TestClock instead of sleeps, typed failure and defect assertions), shipped Effect guidance for each agent, and an agent skill written from the installed Effect release's declarations.
Configures rr (github.com/rileyhilliard/rr) so the project's test, lint, and build commands can run on remote machines over SSH, with a committed .rr.yaml of named tasks, an AGENTS.md section, and the rr Claude Code plugin.