feat: initial maze-ml GA visualizer

config.py

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+from dataclasses import dataclass
+
+@dataclass
+class MazeConfig:
+    # Maze geometry
+    maze_cols: int = 25
+    maze_rows: int = 25
+    cell_size: int = 24
+    wall_width: int = 2
+
+    # GA / Training
+    population: int = 100
+    max_steps: int = 300
+    elite_frac: float = 0.30
+    mutation_std: float = 0.05
+    mutation_rate: float = 0.20
+
+    # Neural net
+    n_inputs: int = 8
+    n_hidden: int = 12
+    n_outputs: int = 4
+
+    # Fitness
+    goal_bonus: float = 1000.0
+    step_penalty: float = 0.01
+
+    # Rendering
+    fps: int = 60
+    trail_decay: float = 0.88
+    window_title: str = "Maze ML — GA Visualizer"
+    hud_font_size: int = 18