Parse MTTS from telnetlib3 writer during connection and store capabilities
on Player.caps field. Add convenience property Player.color_depth that
delegates to caps.color_depth for easy access by rendering code.
Changes:
- Add caps field to Player with default 16-color ANSI capabilities
- Parse MTTS in server shell after Player creation using parse_mtts()
- Add Player.color_depth property for quick capability checks
- Add tests verifying Player caps integration and color_depth property
Extended ansi.py with fg_256, bg_256, fg_rgb, and bg_rgb functions
for generating 256-color and truecolor escape sequences. All functions
include value clamping to valid ranges (0-255).
1000x1000 tile world generated deterministically from a seed using
layered Perlin noise. Terrain derived from elevation: mountains,
forests, grasslands, sand, water, with rivers traced downhill from
peaks. ANSI-colored viewport centered on player.
Command system with registry/dispatch, 8-direction movement (n/s/e/w
+ diagonals), look/l, quit/q. Players see arrival/departure messages.
Set connect_maxwait=0.5 on telnetlib3 to avoid the 4s CHARSET
negotiation timeout — MUD clients reject CHARSET immediately via MTTS.
