build: the unix paths retire — configuration, logs, and volumes move into the danos tree

/etc/init.csv and /etc/devices.csv become /system/configuration/*.csv (the
repo's etc/ moves to system/configuration/, mirroring the runtime tree),
/var/log becomes /system/logs, and /mnt/usb becomes /volumes/usb. The
kernel VFS gains a carve-out so FAT may serve exactly /system/configuration
and /system/logs beneath the initrd-backed /system while /system and /test
themselves stay unshadowable; FAT's single /var mount splits into those two
rewritten mounts. The kvfs readdir check learns /system's third child and
the ramdisk spawn sweep skips the configuration tree.

Suite 106/106.

system/configuration/devices.csv

@@ -0,0 +1,33 @@
+# /system/configuration/devices.csv — the device→driver registry.
+#
+# The device manager reads this at boot and binds each device a bus driver
+# reports to the driver named here. It is AUTHORITATIVE: a device that no row
+# matches goes unbound (logged), never guessed. Edit this file to teach the
+# system new hardware — no recompile of the device manager required.
+#
+# One rule per line, nine comma-separated fields. '#' starts a comment
+# (whole-line or trailing); blank lines are ignored. Whitespace around a field
+# is trimmed, so columns may be padded for readability.
+#
+#   bus      which bus reported the device: pci | usb | acpi
+#   base     PCI base class  / USB class          (hex)
+#   class    PCI subclass    / USB subclass        (hex)
+#   prog_if  PCI prog-IF     / USB protocol         (hex)
+#   vendor   PCI vendor id   / USB idVendor          (hex)
+#   device   PCI device id   / USB idProduct          (hex)
+#   subsystem PCI subsystem, packed (ssvid<<16)|ssid   (hex)
+#   hid      ACPI _HID string (e.g. PNP0303); blank for pci/usb
+#   driver   full ramdisk path of the driver to spawn
+#
+# '*' or an empty field is a wildcard. When several rows match one device the
+# MOST SPECIFIC wins (pinning vendor/device/hid beats pinning only a class), so
+# a generic class rule and a precise vendor:device rule can coexist.
+#
+# bus   base class prog_if vendor device subsystem hid       driver
+pci,    0C,  03,   30,     *,     *,     *,        *,        /system/drivers/usb-xhci-bus
+pci,    03,  80,   *,      1AF4,  1050,  *,        *,        /system/drivers/virtio-gpu
+usb,    03,  01,   01,     *,     *,     *,        *,        /system/drivers/usb-hid-keyboard
+usb,    03,  01,   02,     *,     *,     *,        *,        /system/drivers/usb-hid-mouse
+usb,    08,  06,   50,     *,     *,     *,        *,        /system/drivers/usb-storage
+acpi,   *,   *,    *,      *,     *,     *,        PNP0303,  /system/drivers/ps2-bus
+acpi,   *,   *,    *,      *,     *,     *,        PNP0F13,  /system/drivers/ps2-bus

system/configuration/init-diagnose.csv

@@ -0,0 +1,13 @@
+# /system/configuration/init.csv — diagnose variant (-Ddiagnose), bundled at
+# /system/configuration/init.csv.
+#
+# The display stack (display, display-demo) is omitted so the kernel's timestamped
+# on-screen boot transcript is never suppressed — the bring-up timeline (USB,
+# storage, logger) stays readable on real hardware with no serial. See
+# system/configuration/init.csv for the format; this file must otherwise track it.
+#
+# service                          args...
+/system/services/input
+/system/services/device-manager
+/system/services/fat
+/system/services/logger

system/configuration/init.csv

@@ -0,0 +1,20 @@
+# /system/configuration/init.csv — the services init (PID 1) starts at boot, in order.
+#
+# init reads this at startup and spawns each service supervised (restarting it on
+# a crash, up to a cap). Startup order is top->bottom; shutdown is the reverse, so
+# the logger (last) goes down first and its final drain still has the fat server
+# and the whole storage chain alive underneath it. It is AUTHORITATIVE — there is
+# no hardcoded fallback list; a missing file means no services are started.
+#
+# '#' starts a comment (whole-line or trailing); blank lines are ignored. The
+# first field is the service binary path; any fields after it are the service's
+# argv. Drivers are absent on purpose — the device manager discovers hardware and
+# spawns those (see /system/configuration/devices.csv).
+#
+# service                          args...
+/system/services/input
+/system/services/device-manager
+/system/services/fat
+/system/services/display
+/system/services/display-demo
+/system/services/logger