On macOS, launchd sets XPC_SERVICE_NAME on managed processes but does
not set LAUNCH_JOB_LABEL or LAUNCH_JOB_NAME. Without checking
XPC_SERVICE_NAME, isLikelySupervisedProcess() returns false for
launchd-managed gateways, causing restartGatewayProcessWithFreshPid()
to fork a detached child instead of returning "supervised". The
detached child holds the gateway lock while launchd simultaneously
respawns the original process (KeepAlive=true), leading to an infinite
lock-timeout / restart loop.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>