Set Terminal.app warnOnShellCloseAction=2 ("Ask before closing → Never") on all profiles at install time (provision_terminal_close_warning), plus a standalone slab/bin/slab-no-close-warn applier. Slab-* settings sets are copied from the default profile, so the default carrying =2 means provisioned sets inherit "never warn". The menubar can't set this over AppleScript (only `clean commands` is exposed), and Terminal rewrites its plist on quit — so it must be applied while Terminal is not running. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>