fix: MOTD login resolution + cloud-final/greenboot-success WSL skip

* usr/libexec/mios/mios-dashboard.sh: MIOS_LINUX_USER resolution order
  was MIOS_LINUX_USER="${USER:-mios}" set BEFORE sourcing install.env,
  so when mios-dashboard-issue.service runs as root the dashboard
  rendered `Cockpit https://localhost:9090/  login: root / mios`.
  install.env now sources first; resolution preference is
  install.env-staged MIOS_USER (canonical) > legacy MIOS_LINUX_USER
  alias > $USER (only as last-ditch when both above are unset, for
  dev hand-runs) > literal 'mios'.

* usr/lib/systemd/system/cloud-final.service.d/10-mios-wsl2.conf:
  ConditionVirtualization=!wsl. cloud-final runs `nc /run/cloud-init/
  share/final.sock` to signal a hypervisor; WSL has no such socket
  and the call fails at every boot with `nc: /run/cloud-init/share/
  final.sock: No such file or directory` -- the trailing red line
  in `wsl -d MiOS` console output. Mirrors the existing skip for
  cloud-init-local / cloud-init-network / cloud-config siblings.

* usr/lib/systemd/system/greenboot-success.target.d/10-mios-wsl2.conf:
  ConditionVirtualization=!wsl. greenboot-success.target was missed
  in the original cascade-skip pass -- it chains through
  greenboot-healthcheck -> boot-complete -> boot.mount which needs
  /dev/disk/by-label/boot (unsupported in WSL). With the existing
  greenboot-healthcheck.service drop-in in place, this sibling target
  was the last leg of the cascade still surfacing as failed at boot.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: Kabuki94

usr/lib/systemd/system/cloud-final.service.d/10-mios-wsl2.conf

@@ -0,0 +1,12 @@
+# Skip cloud-init's final stage in WSL.
+#
+# cloud-final.service runs `nc /run/cloud-init/share/final.sock` to
+# signal completion to a hypervisor / cloud platform. WSL2 isn't a
+# cloud platform; the socket is never created and the nc call fails
+# with `nc: /run/cloud-init/share/final.sock: No such file or directory`
+# at every boot, surfacing as the trailing error in the operator's
+# `wsl -d MiOS` console output. Matches the existing skip pattern for
+# cloud-init-local / cloud-init-network / cloud-config in the same
+# directory neighbors.
+[Unit]
+ConditionVirtualization=!wsl

usr/lib/systemd/system/greenboot-success.target.d/10-mios-wsl2.conf

@@ -0,0 +1,14 @@
+# Skip greenboot-success.target on WSL.
+#
+# greenboot-success.target chains into greenboot-healthcheck.service
+# which depends on boot-complete.target which depends on boot.mount
+# which requires /dev/disk/by-label/boot -- a block device WSL doesn't
+# have. The cascade leaves greenboot-success.target stuck in 'failed
+# (dependency)' on every WSL boot. greenboot's purpose (auto-rollback
+# after 3 failed boots) is also moot in WSL: there's no bootloader to
+# count against.
+#
+# Mirrors the existing greenboot-healthcheck.service.d/10-mios-wsl2.conf
+# skip; this target sibling was missed in the original cascade pass.
+[Unit]
+ConditionVirtualization=!wsl

usr/libexec/mios/mios-dashboard.sh

@@ -84,13 +84,21 @@ WIDTH=80
 INNER=$((WIDTH - 4))
 
 # Identity from install.env (written by mios-bootstrap at install time).
+# install.env is sourced FIRST so MIOS_USER lands in env, then we fall
+# back to $USER only when install.env didn't supply a value. The previous
+# order (`MIOS_LINUX_USER="${USER:-mios}"` set BEFORE sourcing) made the
+# MOTD render `login: root / mios` because mios-dashboard-issue.service
+# runs as root -- $USER == 'root' wins over the unset MIOS_LINUX_USER.
 MIOS_VERSION=""
 MIOS_AI_MODEL=""
-MIOS_LINUX_USER="${USER:-mios}"
 if [[ -r /etc/mios/install.env ]]; then
     # shellcheck disable=SC1091
     set -a; source /etc/mios/install.env 2>/dev/null || true; set +a
 fi
+# Resolution order: install.env-staged MIOS_USER (canonical) > MIOS_LINUX_USER
+# (legacy alias if some env path set it) > running-process $USER (only when
+# both above are unset, e.g. running mios-dashboard.sh by hand) > literal 'mios'.
+MIOS_LINUX_USER="${MIOS_USER:-${MIOS_LINUX_USER:-${USER:-mios}}}"
 [[ -z "${MIOS_VERSION:-}" ]] && MIOS_VERSION="$(cat /usr/share/mios/VERSION 2>/dev/null || cat /etc/mios/VERSION 2>/dev/null || echo "0.2.4")"
 MIOS_AI_MODEL="${MIOS_AI_MODEL:-qwen2.5-coder:7b}"