build: Update the vendor NFC tool to v2.5
Replace blantons_nfc_validate.py (v2.3) with the customer's qfx5252-nfc-validate v2.5, renamed so nfc_polling.sh keeps working unchanged. The default 'test --debug' output is the same; bad arguments now print [FAIL] and exit 1. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0131orciRKrejchsuDk6UpXk
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