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456c5d6725
Two issues fixed:
1. Process group cascade: exec-command processes inherited the
container runtime's process group. When an entrypoint script
did kill(0, SIGTERM) during shutdown, it signaled ALL processes
in the group — including other subcontainers' launch wrappers,
causing their PID namespaces to collapse. Fixed by calling
setsid() in exec-command's pre_exec to isolate each service
in its own process group.
2. Unordered daemon termination: removeChild("main") fired
onLeaveContext callbacks for all Daemon.of() instances
simultaneously, bypassing Daemons.term()'s reverse-dependency
ordering. Fixed by having Daemons.build() mark individual
daemons as managed (suppressing their onLeaveContext) and
registering a single onLeaveContext that calls the ordered
Daemons.term(). The term() method is deduplicated so
system.stop() and onLeaveContext share the same shutdown.