Initial commit: SSH MUD server with data-driven world

Rust-based MUD server accepting SSH connections on port 2222.
Players connect with any SSH client, get dropped into a
data-driven world loaded from TOML files at startup.

Binary systems: SSH handling (russh), command parser, game state,
multiplayer broadcast, ANSI terminal rendering.

Data layer: world/ directory with regions, rooms, NPCs, and objects
defined as individual TOML files — no recompile needed to modify.

Commands: look, movement (n/s/e/w/u/d), say, who, help, quit.
Made-with: Cursor

world/town/npcs/barkeep.toml

@@ -0,0 +1,4 @@
+name = "Grizzled Barkeep"
+description = "A weathered man with thick forearms and a permanent scowl. He polishes the same mug endlessly."
+room = "town:tavern"
+dialogue = "Welcome to The Rusty Tankard. We've got ale, and we've got stronger ale. Pick one."