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Replace textual prefix matching in isPrivateIPv6() with numeric bit-prefix matching via ipaddr.js. Closes reachable classifier bypasses for IPv4-compatible IPv6 (::a.b.c.d), site-local fec0::/10, and the full fe80::/10 link-local span, on top of the IPv4-mapped forms. Embedded IPv4 (mapped and compatible) is run through the full isPrivateIPv4 classifier; unparseable input fails closed.
Follow-up hardening to f64cbdda.
Reported-by: tonghuaroot