Efficiency instructions

Read the parent quality instructions before you change a benchmark.

Compare results with the same machine, workload, and process profile.
Do not change benchmark methods during a path migration.
Keep local measurements possible without an n8n Docker image rebuild. State when a benchmark needs an image.
Put task steps and result interpretation in the owning benchmark's README.
Keep shared Playwright reporting and fixtures in ../testing/playwright/. Import them through the package exports.
Keep root checks separate from nested workspaces.