Add MXP telnet negotiation (option 91)#8
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Adds MXP (MUD eXtension Protocol, telnet option 91) negotiation so the game server can emit clickable
<A>/<SEND>links to MUD clients (Mudlet, MUSHclient, etc.).What changed
TelnetConstants.swift:table[91]now announces.will, soannounceSupport()sendsIAC WILL MXP.CommFlags.swift: new.mxpbit (1 << 8).TelnetSession.swift: handleIAC DO MXP(set the flag, emitESC[7zLock-Locked so normal output is never parsed as markup) andIAC DONT MXP(clear it); exposemxpEnabled; addreassertMXP()for copyover restore.The
ESC[7zlocked default means tags are only interpreted inside an explicit secure span (ESC[1z … ESC[2z), which the consumer emits per link — so existing output containing stray< > &is shown verbatim.Tests
Tests/MTHTests/MXPNegotiationTests.swiftcovers the WILL announcement, DO→enabled+locked-default, DONT→disabled, and idempotency.swift testgreen.