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>

selfdrive/ui/qt/onroad.cc

@@ -919,14 +919,14 @@ void AnnotatedCameraWidget::initializeFrogPilotWidgets() {
     animationFrameIndex = (animationFrameIndex + 1) % totalFrames;
   });
 
-  // Initialize the timer for the screen recorder
-  // QTimer *record_timer = new QTimer(this);
-  // connect(record_timer, &QTimer::timeout, this, [this]() {
-  //   if (recorder_btn) {
-  //     recorder_btn->update_screen();
-  //   }
-  // });
-  // record_timer->start(1000 / UI_FREQ);
+  // CLEARPILOT: screen recorder timer — feeds frames to the OMX encoder
+  QTimer *record_timer = new QTimer(this);
+  connect(record_timer, &QTimer::timeout, this, [this]() {
+    if (recorder_btn) {
+      recorder_btn->update_screen();
+    }
+  });
+  record_timer->start(1000 / UI_FREQ);
 }
 
 void AnnotatedCameraWidget::updateFrogPilotWidgets() {
@@ -1016,7 +1016,7 @@ void AnnotatedCameraWidget::paintFrogPilotWidgets(QPainter &p) {
     drawSLCConfirmation(p);
   }
 
-  // recorder_btn->setVisible(scene.screen_recorder && !mapOpen);
+  // CLEARPILOT: screen recorder runs invisibly, no UI button shown
   recorder_btn->setVisible(false);
 }