Replace list-based room display with proper 2D tile map using Binary
Space Partitioning. Rooms are carved into a 60x20 grid, connected by
L-shaped corridors, and rendered with ANSI-colored ASCII art including
fog of war visibility.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Add title, lobby, class select, game, shop, and result screens.
Rewrite model.go with 6-screen state machine and input routing.
Wire server/ssh.go and main.go with lobby and store.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
