dashcamd v3: trip directories, state machine, graceful shutdown

Dashcam recording now organized by trip in /data/media/0/videos/YYYYMMDD-HHMMSS/.
Starts recording immediately on launch (with 10-min idle timer), transitions to
continuous recording when drive gear detected. New trip on every ignition cycle.
Graceful shutdown via DashcamShutdown param with 15s ack timeout in thermald.

- Bitrate reduced to 2500 kbps (was 4 Mbps)
- Trip state machine: IDLE → RECORDING ↔ IDLE_TIMEOUT → TRIP_ENDED
- Deleter: trip-aware deletion (oldest trip first, then segments within active trip)
- camerad changed to always_run (was driverview) so dashcam works offroad
- DashcamShutdown param for graceful close before device power-off

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

system/loggerd/deleter.py

@@ -49,18 +49,51 @@ def get_preserved_segments(dirs_by_creation: list[str]) -> list[str]:
 
 
 def delete_oldest_video():
-  """CLEARPILOT: delete the oldest screen recording MP4 when disk space is low."""
+  """CLEARPILOT: delete oldest dashcam footage when disk space is low.
+  Trip directories are /data/media/0/videos/YYYYMMDD-HHMMSS/ containing .mp4 segments.
+  Deletes entire oldest trip directory first. If only one trip remains (active),
+  deletes individual segments oldest-first within it. Also cleans up legacy flat .mp4 files."""
   try:
     if not os.path.isdir(VIDEOS_DIR):
       return False
-    videos = sorted(
-      (f for f in os.listdir(VIDEOS_DIR) if f.endswith('.mp4')),
-      key=lambda f: os.path.getctime(os.path.join(VIDEOS_DIR, f))
-    )
-    if not videos:
+
+    # Collect legacy flat mp4 files and trip directories
+    legacy_files = []
+    trip_dirs = []
+    for entry in os.listdir(VIDEOS_DIR):
+      path = os.path.join(VIDEOS_DIR, entry)
+      if os.path.isfile(path) and entry.endswith('.mp4'):
+        legacy_files.append(entry)
+      elif os.path.isdir(path):
+        trip_dirs.append(entry)
+
+    # Delete legacy flat files first (oldest by name)
+    if legacy_files:
+      legacy_files.sort()
+      delete_path = os.path.join(VIDEOS_DIR, legacy_files[0])
+      cloudlog.info(f"deleting legacy video {delete_path}")
+      os.remove(delete_path)
+      return True
+
+    if not trip_dirs:
       return False
-    delete_path = os.path.join(VIDEOS_DIR, videos[0])
-    cloudlog.info(f"deleting video {delete_path}")
+
+    trip_dirs.sort()  # sorted by timestamp name = chronological order
+
+    # If more than one trip, delete the oldest entire trip directory
+    if len(trip_dirs) > 1:
+      delete_path = os.path.join(VIDEOS_DIR, trip_dirs[0])
+      cloudlog.info(f"deleting trip {delete_path}")
+      shutil.rmtree(delete_path)
+      return True
+
+    # Only one trip left (likely active) — delete oldest segment within it
+    trip_path = os.path.join(VIDEOS_DIR, trip_dirs[0])
+    segments = sorted(f for f in os.listdir(trip_path) if f.endswith('.mp4'))
+    if not segments:
+      return False
+    delete_path = os.path.join(trip_path, segments[0])
+    cloudlog.info(f"deleting segment {delete_path}")
     os.remove(delete_path)
     return True
   except OSError: