init: cutover — driver-manager owns the boot path, pcid-spawner gated as fallback

- 00_driver-manager.service: resident daemon args (--hotplug); runs
  unless /etc/driver-manager.d/disabled exists.
- 40_driver-manager-initfs.service: gate flipped from opt-in
  (initfs-active) to default-on (!/etc/driver-manager.d/disabled).
- 00_pcid-spawner.service + 40_pcid-spawner-initfs.service: gated to
  start only when /etc/driver-manager.d/disabled exists — the legacy
  spawner remains staged as the operator fallback, never deleted.

init.d/00_driver-manager.service

@@ -18,8 +18,9 @@ description = "Driver manager (post-switchroot /usr spawner)"
 
 [service]
 cmd = "driver-manager"
-args = ["--rootfs"]
-# oneshot so a hypothetical bind handle error doesn't loop the manager
+# Resident daemon: initial enumeration, then the hotplug loop forever.
+args = ["--hotplug"]
+# oneshot_async so init does not block on the manager's readiness.
 type = "oneshot_async"
 # Operator must explicitly enable this service:
 #   touch /etc/driver-manager.d/disabled  # force fallback to pcid-spawner

init.d/00_pcid-spawner.service

@@ -3,6 +3,11 @@ description = "PCI driver spawner"
 
 [service]
 cmd = "pcid-spawner"
+# Fallback-only since the driver-manager cutover: this service starts only
+# when the operator forces the legacy spawner back on with
+#   touch /etc/driver-manager.d/disabled
+# Otherwise driver-manager (00_driver-manager.service) owns the boot path.
+ConditionPathExists = "/etc/driver-manager.d/disabled"
 # oneshot_async, NOT oneshot: this is the post-switchroot /usr driver-manager.
 # As a blocking oneshot, init waits for pcid-spawner to enumerate PCI and bring
 # every matched driver to readiness (daemon::Daemon::spawn blocks on each

init.initfs.d/40_driver-manager-initfs.service

@@ -15,7 +15,7 @@ requires_weak = ["10_inputd.service", "20_graphics.target", "40_pcid.service"]
 cmd = "driver-manager"
 args = ["--initfs"]
 type = "oneshot"
-# Operator must explicitly enable this service by removing the
-# ConditionPathExists flag (C2 wiring). Until then, pcid-spawner
-# initfs continues to operate.
-ConditionPathExists = "/etc/driver-manager.d/initfs-active"
+# Active by default since the cutover. Operator falls back to the legacy
+# pcid-spawner initfs path with:
+#   touch /etc/driver-manager.d/disabled
+ConditionPathExists = "!/etc/driver-manager.d/disabled"

init.initfs.d/40_pcid-spawner-initfs.service

@@ -5,4 +5,7 @@ requires_weak = ["10_inputd.service", "20_graphics.target", "40_pcid.service"]
 [service]
 cmd = "pcid-spawner"
 args = ["--initfs"]
+# Fallback-only since the driver-manager cutover: starts only when the
+# operator forces the legacy spawner with /etc/driver-manager.d/disabled.
+ConditionPathExists = "/etc/driver-manager.d/disabled"
 type = "oneshot"