Per NXP datasheets (NT4H1321, NT4H2421), NTAG DNA chips return product
type 0x04 with major version 0x04, distinguished by subtype:
- NTAG 413 DNA: subtype 0x02
- NTAG 424 DNA: subtype 0x05
- NTAG 424 DNA TT: subtype 0x04
Previously incorrectly expected product type 0x21 or hwMajor >= 0x30,
causing Spark 2 implants to be detected as "DESFire Unknown" when the
vivokey.co NDEF record was not present.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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