[HarryCordewener]

Requested by Grave · project thread

Item 1b of the implementation plan. Stacked on 1a (#69).

What changed

• Core.Hello and Core.Supports.Set (Char, Char.Skills, Char.Items, Room, Comm.Channel) once GMCP is agreed; MSDP REPORTs for the variables the status row reads. F5 gmcp modules adds more per world.
• GameDataStore per session; status-row meters (F7 ▸ meters); ⌃P ▸ Show game data; Lua gmcp.get, msdp.get, gmcp.send.

Decisions

• Nothing GMCP is sent before the server agrees (the unsolicited-negotiation rule). MSDP has no negotiated callback in the library, so IAC DO MSDP is spotted on the write path and the reports follow it.
• GMCP objects merge key by key (IRE and Aardwolf send partial Char.Vitals). MSDP variables are stored as MSDP.NAME, so one path syntax reads both.
• Payloads over 64 KiB and packages past 512 are dropped.
• A meter appears only once its value has arrived, and from then its width is reserved, so the row never reflows as numbers change.

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