_parse_edns_size only extracted the requestor UDP size; every other field in
the OPT record (DO bit, EDNS version, extended RCODE, all sub-options) was
invisible. Replaced with _parse_opt_record returning a full dict:
udp_size, ext_rcode, version, do_bit, z, options[(code, len, data)]
NSID request (option code 3) is now detected as fingerprint_probe with
probe=edns_nsid and contributes to recon_burst. DO bit, COOKIE (10), and
other options are not escalated; udp_size continues to drive amp_probe.
anti
a6b5b1a7f8