UPDATE_LOCK_FILE: Path = PATHS.installation.locks_dir 'update.lock'Advisory lock file serializing dcode self-upgrades across processes.
Held for the duration of an install by whichever process is upgrading, so
several concurrently launched terminals do not each run their own
uv tool install -U against the same tool environment. Carries no data — only
the lock matters. Its installation-derived location is shared by every profile
that launches this tool environment. See update_install_lock.