- Add get_last_bytes.sh to extract final 2 bytes from IUM files
- Add read_bytes.sh for reading specific byte offsets from binaries
- Add pack_resources.sh to package and upload CP02S resources to S3
- Add signer_new.py for firmware and bootloader signing with custom SHA1
- Update extract_firmware.sh to use fixed output filenames
- Update README.md with comprehensive documentation for new tools
