reset to pre-modification baseline; restart feature work from clean state

Restoring the working tree to the pristine pre-Claude baseline previously
preserved at /data/clearpilot (now /data/clearpilot-baseline). The prior
modified-but-broken tree is snapshotted at /data/openpilot-broken-2026-05-03
and tagged here as pre-reset-2026-05-03 for reference.

From here, features (UI changes, dashcam, telemetry, GPS, display modes,
speed logic, standstill power saving, etc.) will be re-introduced one at
a time with proper testing.

launch_chffrplus.sh

@@ -79,15 +79,9 @@ function launch {
     agnos_init
   fi
 
-  # CLEARPILOT: kill stale error display from previous build/run
-  pkill -f "selfdrive/ui/text" 2>/dev/null
-
   # write tmux scrollback to a file
   tmux capture-pane -pq -S-1000 > /tmp/launch_log
 
-  # Preflight: create dirs git can't track
-  source "$DIR/build_preflight.sh"
-
   # start manager
   cd selfdrive/manager
   if [ ! -f $DIR/prebuilt ]; then