Why: The restored postmaster refused to start because the results-directory socket path exceeded the 107-byte Unix socket limit.
Evidence: restore/postgres.log from backup-20261012-150713 says the socket path is too long (SELF). bash -n passed.
Impact: The restored instance listens on /tmp/u7bk-18997, and cleanup removes that directory.
Refs: feature/u7-ops-drills
Co-authored-by: Cursor <cursoragent@cursor.com>