Preserve patched_at across the post-restart re-mount

create_task.py verify decides "loaded" by comparing middlewared's start time
against hook_status.json's patched_at. The post-restart re-mount restores the
same patch the boot pass already applied, but it runs after the restart — so
letting apply.sh re-stamp made patched_at newer than the process that had
correctly imported the patch, and verify reported FAIL while everything was
working. That would have fired on every boot where docker's nvidia sysext
merge detaches the overlay.

Found on hardware while exercising the candidate: a new lying status
introduced by the fix for a lying status. The snapshot lives in /run, not the
repo — a leftover file there would leave the tree dirty, which update.sh
refuses to run over.

patch/wait_restart.sh

@@ -143,7 +143,26 @@ else
     _log "nvidia sysext merge follows it) -- re-mounting for the next restart."
     _log "Whether THIS middlewared loaded the patch is answered in-process by"
     _log "the 'installed but NOT loaded' alert, not by this check."
+
+    # Preserve hook_status.json's patched_at across this re-mount.
+    #
+    # create_task.py verify decides "loaded" by comparing middlewared's start
+    # time against patched_at. This re-apply restores the SAME patch the boot
+    # pass already applied, but it runs *after* the restart -- so letting it
+    # re-stamp would make patched_at newer than the process that correctly
+    # imported the patch, and verify would report FAIL forever, on every boot
+    # where docker's sysext merge detaches the overlay. That is precisely the
+    # lying-status failure this release exists to remove, so do not introduce a
+    # new one. The snapshot lives in /run, never in the repo: a leftover file
+    # there would leave the tree dirty and update.sh refuses to run over that.
+    _saved_status=/run/truecloud-hook_status.pre
+    cp -p "$PATCH_DIR/hook_status.json" "$_saved_status" 2>/dev/null
+
     TRUECLOUD_REAPPLY=1 /bin/bash "$PATCH_DIR/patch/apply.sh"
+
+    if [ -f "$_saved_status" ]; then
+        mv -f "$_saved_status" "$PATCH_DIR/hook_status.json" 2>/dev/null
+    fi
 fi
 
 _log "=== deferred restart complete ==="