session logging, build-only mode, park splash, boot logo spinner

- Per-process stderr logging to /data/log2/{session}/ with time-safe
  directory naming (boot-xxx renamed once GPS/NTP sets clock)
- Aggregate session.log with major events (start/stop, transitions)
- 30-day log rotation cleanup on manager startup
- build_only.sh: compile without starting manager, non-blocking error
  display, kills stale processes
- build.py: copies updated spinner binary after successful build
- Onroad park mode: show splash screen when car is on but in park,
  switch to camera view when shifted to drive, honor screen on/off
- Spinner: full-screen boot logo background from /usr/comma/bg.jpg
  with white progress bar overlay
- Boot logo: auto-regenerate when boot_logo.png changes, 140% scale
- launch_openpilot.sh: cd to /data/openpilot for reliable execution
- launch_chffrplus.sh: kill stale text error displays on startup
- spinner shell wrapper: prefer freshly built _spinner over prebuilt

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

system/clearpilot/startup_logo/generate_logo.sh

@@ -3,8 +3,9 @@
 # Create a 2160x1080 true color bitmap canvas with black background
 convert -size 2160x1080 canvas:black /tmp/black_canvas.png
 
-# Place the image in the center of the canvas, blending the transparent background
-composite -gravity center /data/openpilot/selfdrive/clearpilot/theme/clearpilot/images/boot_logo.png /tmp/black_canvas.png /tmp/centered_image.png
+# Scale logo 140% then center on canvas
+convert /data/openpilot/selfdrive/clearpilot/theme/clearpilot/images/boot_logo.png -resize 140% /tmp/scaled_logo.png
+composite -gravity center /tmp/scaled_logo.png /tmp/black_canvas.png /tmp/centered_image.png
 
 # Rotate the image clockwise 90 degrees
 convert /tmp/centered_image.png -rotate 90 /tmp/rotated_image.png
@@ -13,4 +14,4 @@ convert /tmp/centered_image.png -rotate 90 /tmp/rotated_image.png
 convert /tmp/rotated_image.png -quality 95 /data/openpilot/system/clearpilot/startup_logo/bg.jpg
 
 # Clean up temporary files
-rm /tmp/black_canvas.png /tmp/centered_image.png /tmp/rotated_image.png
+rm /tmp/black_canvas.png /tmp/scaled_logo.png /tmp/centered_image.png /tmp/rotated_image.png

system/clearpilot/startup_logo/set_logo.sh

@@ -3,6 +3,13 @@
 set -x   
 
 
+# CLEARPILOT: regenerate bg.jpg if boot_logo.png is newer (handles logo changes)
+BOOT_LOGO="/data/openpilot/selfdrive/clearpilot/theme/clearpilot/images/boot_logo.png"
+GENERATED_BG="/data/openpilot/system/clearpilot/startup_logo/bg.jpg"
+if [ "$BOOT_LOGO" -nt "$GENERATED_BG" ] 2>/dev/null; then
+    bash /data/openpilot/system/clearpilot/startup_logo/generate_logo.sh
+fi
+
 # Check if md5sum of /usr/comma/bg.jpg is not equal to md5sum of /data/openpilot/system/clearpilot/startup_logo/bg.jpg
 if [ "$(md5sum /usr/comma/bg.jpg | awk '{print $1}')" != "$(md5sum /data/openpilot/system/clearpilot/startup_logo/bg.jpg | awk '{print $1}')" ]; then
     bash /data/openpilot/system/clearpilot/startup_logo/generate_logo.sh