banredirect: +b mask$#chan bounces a banned user to another channel (loop-guarded)

echoircd.conf.example

@@ -117,6 +117,10 @@ amu_target    = both
 # hidewhois_hide_server = yes  # hide 312
 # hidewhois_hide_idle = yes    # hide 317
 # hidewhois_hide_secure = yes  # hide 671
+# --- banredirect (m_banredirect): no config needed — it extends ban syntax. A
+#     ban `+b <mask>$<#channel>` bounces a matching user into #channel instead of
+#     refusing them, e.g.  /MODE #main +b *!*@*.spammer.net$#quarantine
+#     The redirect fires at most once (never loops).
 # --- solvemsg (m_solvemsg): an un-vouched user must answer one arithmetic
 #     question before their private messages are delivered (opers & logged-in
 #     accounts are exempt). Cheap anti-spam-bot gate.