Closes the C18 capability gap: manager-mediated system PM with
priority-ordered iteration.
Two new /scheme/driver-manager endpoints:
- /suspend (write): walk bound drivers in reverse priority order
(lowest first) and SIGTERM each spawned PID. Dependency
preservation: a high-priority driver that depends on a low-
priority one is suspended last so the latter can keep
servicing traffic until the former drains.
- /resume (write): walk bound drivers in priority order (highest
first). Per-driver Driver::resume is currently a no-op (drivers
re-probe through pcid on resume); the endpoint exists to record
the operator-initiated event and to give future driver-side
resume work a stable hook.
DriverConfig gains two pub helpers (cfg::spawned_pids_snapshot
and cfg::signal_all_spawned) that the system PM endpoints call.
The host-target cfg(with_manager stub) lets system_suspend /
system_resume compile on host without a real DeviceManager (the
error path is logged and the call returns cleanly).
Tests (2 new):
- spawned_pids_snapshot_returns_empty_for_unbound_driver
- signal_all_spawned_returns_zero_for_unbound_driver
134 driver-manager tests pass.
vasilito
487d9e6410