Development record

abcd implement load --wait -- <command> exits 1 when the gated command is killed by a signal: runGated in internal/surface/cli/implement_load.go maps any non-positive exit code to 1. The help and commands/implement.md promise the waiter exits with the command's code, so a SIGTERM to the waiter leaves make preflight dead by SIGTERM and the waiter exits 1, which reads exactly like a preflight that failed a gate.