Switch from systemd-networkd to NetworkManager, add AGENTS.md

- Replace systemd-networkd/resolved symlinks with NetworkManager
- Remove unused networkd config files (ethernet, wlan, wwan)
- Add AGENTS.md for CI/agent guidance
- Update motd and packages.x86_64

airootfs/etc/motd

@@ -1,7 +1,7 @@
 To install Arch Linux follow the installation guide:
 https://wiki.archlinux.org/title/Installation_guide
 
-For Wi-Fi, authenticate to the wireless network using the iwctl utility.
+For Wi-Fi, run nmtui to configure a wireless network.
 For mobile broadband (WWAN) modems, connect with the mmcli utility.
 Ethernet, WLAN and WWAN interfaces using DHCP should work automatically.
 

airootfs/etc/systemd/network/20-ethernet.network

@@ -1,22 +0,0 @@
-[Match]
-Type=ether
-# Exclude virtual Ethernet interfaces
-Kind=!*
-
-[Link]
-RequiredForOnline=routable
-
-[Network]
-DHCP=yes
-MulticastDNS=yes
-
-# systemd-networkd does not set per-interface-type default route metrics
-# https://github.com/systemd/systemd/issues/17698
-# Explicitly set route metric, so that Ethernet is preferred over Wi-Fi and Wi-Fi is preferred over mobile broadband.
-# Use values from NetworkManager. From nm_device_get_route_metric_default in
-# https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/blob/main/src/core/devices/nm-device.c
-[DHCPv4]
-RouteMetric=100
-
-[IPv6AcceptRA]
-RouteMetric=100

airootfs/etc/systemd/network/20-wlan.network

@@ -1,20 +0,0 @@
-[Match]
-Type=wlan
-
-[Link]
-RequiredForOnline=routable
-
-[Network]
-DHCP=yes
-MulticastDNS=yes
-
-# systemd-networkd does not set per-interface-type default route metrics
-# https://github.com/systemd/systemd/issues/17698
-# Explicitly set route metric, so that Ethernet is preferred over Wi-Fi and Wi-Fi is preferred over mobile broadband.
-# Use values from NetworkManager. From nm_device_get_route_metric_default in
-# https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/blob/main/src/core/devices/nm-device.c
-[DHCPv4]
-RouteMetric=600
-
-[IPv6AcceptRA]
-RouteMetric=600

airootfs/etc/systemd/network/20-wwan.network

@@ -1,19 +0,0 @@
-[Match]
-Type=wwan
-
-[Link]
-RequiredForOnline=routable
-
-[Network]
-DHCP=yes
-
-# systemd-networkd does not set per-interface-type default route metrics
-# https://github.com/systemd/systemd/issues/17698
-# Explicitly set route metric, so that Ethernet is preferred over Wi-Fi and Wi-Fi is preferred over mobile broadband.
-# Use values from NetworkManager. From nm_device_get_route_metric_default in
-# https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/blob/main/src/core/devices/nm-device.c
-[DHCPv4]
-RouteMetric=700
-
-[IPv6AcceptRA]
-RouteMetric=700

airootfs/etc/systemd/system/multi-user.target.wants/NetworkManager.service

@@ -0,0 +1,30 @@
+[Unit]
+Description=Network Manager
+Documentation=man:NetworkManager.conf(5)
+Wants=NetworkManager-wait-online.service
+After=sysinit.target network-pre.target
+Wants=network-pre.target
+Before=network-online.target remote-fs.target
+After=network-pre.target
+BindsTo=sys-subsystem-net-devices.target
+After=sys-subsystem-net-devices.target
+
+[Service]
+Type=dbus
+BusName=org.freedesktop.NetworkManager
+ExecCondition=/usr/bin/test -x /usr/bin/NetworkManager
+ExecReload=/usr/bin/kill -HUP $MAINPID
+ExecStart=/usr/bin/NetworkManager --no-daemon
+Restart=on-failure
+KillMode=process
+CapabilityBoundingSet=CAP_NET_ADMIN CAP_NET_BIND_SERVICE CAP_SYS_PTRACE CAP_DAC_READ_SEARCH CAP_DAC_OVERRIDE
+LockPersonality=yes
+MemoryDenyWriteExecute=yes
+ProtectHome=yes
+ProtectSystem=yes
+RestrictNamespaces=yes
+RestrictRealtime=yes
+SystemCallFilter=@system-service
+
+[Install]
+WantedBy=multi-user.target

airootfs/etc/systemd/system/multi-user.target.wants/systemd-networkd.service

@@ -1 +0,0 @@
-/usr/lib/systemd/system/systemd-networkd.service

airootfs/etc/systemd/system/multi-user.target.wants/systemd-resolved.service

@@ -1 +0,0 @@
-/usr/lib/systemd/system/systemd-resolved.service