Card: 20M puzzles, 16 puzzle types, unique config, v2 schema

stats for the 20M build

unique config: 200k puzzles with exactly one solution, human-rated

20M puzzles: 9 new puzzle types, v2 schema, unbiased 90/5/5 splits

10,000,000 puzzles: 9M more (bigger boards weighted), unbiased 90/5/5 hash splits

Link to renamed GitHub repo ThVerg/AiZipSolve

Add 990k Zip puzzles on graphs (2D, walls, masks, islands, 3D, 4D)

initial commit