dashcam: re-enable screen recorder, disable training data video

- Re-enable FrogPilot OMX screen recorder (H.264 MP4, 1440x720, 2Mbps)
- Auto-start recording when car is on, auto-stop when off
- Hide all recorder UI elements (invisible to driver)
- Add ScreenRecorderDebug param for bench testing without car
- Disable encoderd (camera .hevc files) — CAN/sensor logs still recorded
- Raise deleter free space threshold from 5GB to 9GB
- Deleter rotates oldest videos before log segments
- Add CLAUDE.md project documentation

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

system/loggerd/deleter.py

@@ -8,11 +8,15 @@ from openpilot.system.loggerd.config import get_available_bytes, get_available_p
 from openpilot.system.loggerd.uploader import listdir_by_creation
 from openpilot.system.loggerd.xattr_cache import getxattr
 
-MIN_BYTES = 5 * 1024 * 1024 * 1024
+# CLEARPILOT: increased from 5 GB to 9 GB to reserve space for screen recordings
+MIN_BYTES = 9 * 1024 * 1024 * 1024
 MIN_PERCENT = 10
 
 DELETE_LAST = ['boot', 'crash']
 
+# CLEARPILOT: screen recorder video directory
+VIDEOS_DIR = '/data/media/0/videos'
+
 PRESERVE_ATTR_NAME = 'user.preserve'
 PRESERVE_ATTR_VALUE = b'1'
 PRESERVE_COUNT = 5
@@ -44,12 +48,37 @@ def get_preserved_segments(dirs_by_creation: list[str]) -> list[str]:
   return preserved
 
 
+def delete_oldest_video():
+  """CLEARPILOT: delete the oldest screen recording MP4 when disk space is low."""
+  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:
+      return False
+    delete_path = os.path.join(VIDEOS_DIR, videos[0])
+    cloudlog.info(f"deleting video {delete_path}")
+    os.remove(delete_path)
+    return True
+  except OSError:
+    cloudlog.exception(f"issue deleting video from {VIDEOS_DIR}")
+    return False
+
+
 def deleter_thread(exit_event):
   while not exit_event.is_set():
     out_of_bytes = get_available_bytes(default=MIN_BYTES + 1) < MIN_BYTES
     out_of_percent = get_available_percent(default=MIN_PERCENT + 1) < MIN_PERCENT
 
     if out_of_percent or out_of_bytes:
+      # CLEARPILOT: try deleting oldest video first, then fall back to log segments
+      if delete_oldest_video():
+        exit_event.wait(.1)
+        continue
+
       dirs = listdir_by_creation(Paths.log_root())
 
       # skip deleting most recent N preserved segments (and their prior segment)