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.

build_only.sh

@@ -1,38 +0,0 @@
-#!/usr/bin/bash
-# CLEARPILOT: build-only mode — compile without starting manager.
-# On failure: shows error on screen (non-blocking) and exits nonzero with stderr output.
-# On success: exits 0, does not start manager.
-#
-# Usage: su - comma -c "bash /data/openpilot/build_only.sh"
-
-BASEDIR="/data/openpilot"
-
-# Fix ownership — we edit as root, openpilot builds/runs as comma
-sudo chown -R comma:comma "$BASEDIR"
-
-# Kill stale error displays and any running manager/launch/managed processes
-pkill -9 -f "selfdrive/ui/text" 2>/dev/null
-pkill -9 -f 'launch_openpilot.sh' 2>/dev/null
-pkill -9 -f 'launch_chffrplus.sh' 2>/dev/null
-pkill -9 -f 'python.*manager.py' 2>/dev/null
-pkill -9 -f 'selfdrive\.' 2>/dev/null
-pkill -9 -f 'system\.' 2>/dev/null
-pkill -9 -f './ui' 2>/dev/null
-sleep 1
-
-source "$BASEDIR/launch_env.sh"
-
-ln -sfn "$BASEDIR" /data/pythonpath
-export PYTHONPATH="$BASEDIR"
-
-# Hardware init (GPU perms)
-sudo chgrp gpu /dev/adsprpc-smd /dev/ion /dev/kgsl-3d0 2>/dev/null
-sudo chmod 660 /dev/adsprpc-smd /dev/ion /dev/kgsl-3d0 2>/dev/null
-
-# Preflight: create dirs git can't track
-source "$BASEDIR/build_preflight.sh"
-
-cd "$BASEDIR/selfdrive/manager"
-rm -f "$BASEDIR/prebuilt"
-
-BUILD_ONLY=1 exec ./build.py