XBLK binary format for pattern library in NTAG5 upper 1K EEPROM:
- 16-byte header (magic, version, pattern count, active index, CRC-16)
- Up to 9 × 112-byte fixed-size pattern entries
- Deserializer + serializer in src/pattern/mod.rs
- MCU self-provisions hardcoded patterns on first boot (no XBLK found)
- Subsequent boots load active pattern directly from EEPROM
- Python serializer tool for future PCSC-based pattern uploads
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
