tls-modern-client - bring the 9legacy TLS client to modern HTTPS:
    X25519 + NIST ECDHE, AEAD, SNI, ECDSA certs, X.509 chain + hostname +
    validity-window verify (default-on via /sys/lib/tls/ca.pem).

abaco-modern - modernize the 9legacy abaco browser:
    NOTES bug fixes (text selection, double-click), html(2) field wiring,
    UTF-8 default charset, webfs cookie support, failure-path error prefix,
    relative-BASE-href crash guard.

webfs-readline-overflow - fix a dormant Ibuf pointer-reset bug in
    /sys/src/cmd/webfs/buf.c readline(); affects any webfs consumer driving
    sustained parallel reads (observed in abaco loading modern HTTPS pages).

libregexp-listsize-bump - bump LISTSIZE 10 → 12 in libregexp/regcomp.h to
    dodge an off-by-one in rregexec's thread-list overflow detection; the
    OOB byte write corrupts heap memory adjacent to the regex engine's
    stack.  Affects any libregexp consumer with a large enough regex.