[HarryCordewener]

Requested by Grave · project thread

Follow-up to #78. TelnetNegotiationCore 4.5.3 on nuget.org ships MSPProtocol (TNC #171).

• Bumps TelnetNegotiationCore from 4.5.2 to 4.5.3.
• TelnetSessionOptions.PlaysMsp is off by default and set from WorldSession.PlaysMedia. When it is on, TelnetSession registers MSPProtocol and raises MspChanged from its enabled and disabled callbacks. The MspTrigger path from Read MSP sound triggers on connections that agreed MSP #78 then reads !!SOUND/!!MUSIC lines on a connection that agreed option 90.
• With no device, or with game sound off, the plugin is left unregistered and the server's WILL MSP is refused. Registering the plugin is how the library says the client plays sound.
• MspNegotiationTests covers two cases: a session that plays sound answers DO, then DONT when the server withdraws, and raises true then false; a session that doesn't play sound answers DONT and raises nothing.
• CLAUDE.md drops its "inert until" note, and there is a changelog line.

Tests: Graphics 99, Scripting 68, Web 37, Tui 2088 and Avalonia 211 all pass. Core passes 1346 of 1347; the one failure is AReadOnlyCacheDirectory_DegradesToMemoryOnly, which always fails when the tests run as root, as they do in this sandbox.

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