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.

selfdrive/ui/soundd.py

@@ -93,27 +93,6 @@ class Soundd:
 
     self.spl_filter_weighted = FirstOrderFilter(0, 2.5, FILTER_DT, initialized=False)
 
-    # ClearPilot ding (plays independently of alerts)
-    self.ding_sound = None
-    self.ding_frame = 0
-    self.ding_playing = False
-    self.ding_check_counter = 0
-    self._load_ding()
-
-  def _load_ding(self):
-    ding_path = BASEDIR + "/selfdrive/clearpilot/sounds/ding.wav"
-    try:
-      wavefile = wave.open(ding_path, 'r')
-      assert wavefile.getnchannels() == 1
-      assert wavefile.getsampwidth() == 2
-      assert wavefile.getframerate() == SAMPLE_RATE
-      length = wavefile.getnframes()
-      self.ding_sound = np.frombuffer(wavefile.readframes(length), dtype=np.int16).astype(np.float32) / (2**16/2)
-      cloudlog.info(f"ClearPilot ding loaded: {length} frames")
-    except Exception as e:
-      cloudlog.error(f"Failed to load ding sound: {e}")
-      self.ding_sound = None
-
   def load_sounds(self):
     self.loaded_sounds: dict[int, np.ndarray] = {}
 
@@ -158,20 +137,7 @@ class Soundd:
         written_frames += frames_to_write
         self.current_sound_frame += frames_to_write
 
-    ret = ret * self.current_volume
-
-    # Mix in ClearPilot ding (independent of alerts, always max volume)
-    if self.ding_playing and self.ding_sound is not None:
-      ding_remaining = len(self.ding_sound) - self.ding_frame
-      if ding_remaining > 0:
-        frames_to_write = min(ding_remaining, frames)
-        ret[:frames_to_write] += self.ding_sound[self.ding_frame:self.ding_frame + frames_to_write] * MAX_VOLUME
-        self.ding_frame += frames_to_write
-      else:
-        self.ding_playing = False
-        self.ding_frame = 0
-
-    return ret
+    return ret * self.current_volume
 
   def callback(self, data_out: np.ndarray, frames: int, time, status) -> None:
     if status:
@@ -231,14 +197,6 @@ class Soundd:
 
         self.get_audible_alert(sm)
 
-        # ClearPilot: check for ding trigger at ~2Hz
-        self.ding_check_counter += 1
-        if self.ding_check_counter % 10 == 0 and self.ding_sound is not None:
-          if self.params_memory.get("ClearpilotPlayDing") == b"1":
-            self.params_memory.put("ClearpilotPlayDing", "0")
-            self.ding_playing = True
-            self.ding_frame = 0
-
         rk.keep_time()
 
         assert stream.active