Fix algorithm selection issue - add missing cityMap to algorithms array

[Copilot]

Fixes an issue where the cityMap algorithm was not accessible through the UI algorithm cycling, despite being fully implemented and set as the default in DungeonConfig.

Problem

The game defines 4 dungeon generation algorithms in GenerationAlgorithm enum:

• roomsCorridors
• bsp
• cellular
• cityMap (default algorithm)

However, the GameScene.algorithms array only contained 3 algorithms, missing cityMap:

// Before - missing cityMap
private let algorithms: [GenerationAlgorithm] = [.roomsCorridors, .bsp, .cellular]

This meant that:

• Users could only cycle through 3 of 4 available algorithms
• The cityMap algorithm was never accessible via UI despite being fully functional
• The DungeonConfig default of .cityMap was always overridden by the limited selection

Solution

Added the missing .cityMap algorithm to the algorithms array:

// After - includes all algorithms
private let algorithms: [GenerationAlgorithm] = [.roomsCorridors, .bsp, .cellular, .cityMap]

Verification

• All infrastructure for cityMap already exists (CityMapGenerator, HUD display, DungeonGenerator routing)
• Added test testAllAlgorithmsAvailable() to prevent future regressions
• No existing functionality is affected - this only adds the missing algorithm to the cycling selection

The fix is minimal and surgical, addressing the root cause without modifying any existing logic.

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