Dependency updates are handled manually, so the scheduled Renovate job
only cost a daily privileged Docker run on the deploy host. The empty
cache directory it maintained is gone too, and the operations note now
records that updates are manual instead of describing bot behaviour.
Drop the unused knip dead-code check and the husky+lint-staged pre-commit hook pipeline. All checks remain covered by the CI workflow (lint, typecheck, i18n, tests).