Thread *rand.Rand through GenerateFloor, splitBSP, and RandomRoomType
so floors can be reproduced from a seed. This enables daily challenges
in Phase 3. All callers now create a local rng instance.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Add RoomSecret (5% chance) and RoomMiniBoss room types. Add 4 mini-boss
monsters at 60% of boss stats (Guardian's Herald, Warden's Shadow,
Overlord's Lieutenant, Archlich's Harbinger) with IsMiniBoss flag and
boss pattern logic. Secret rooms grant double treasure. Mini-boss rooms
are placed on floors 4/9/14/19 at room index 1.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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>
