nx_maze_gen.nx

nx_maze_gen.nx -- LIB: three foundational rungs toward AUTONOMOUS S-class game emission, in pure-integer Nishi (no float, no third-party): procgen-solvable : mz_gen builds a maze by integer DFS recursive-backtracker -> a SPANNING TREE, so EVERY cell is reachable BY CONSTRUCTION (an emitted level can never be unsolvable). gate-solvable : mz_solve is a BFS solver that PROVES a start->exit path exists (returns its length) or reports UNSOLVABLE (-1). The validation gate that makes "automatically emit a game" SAFE: no emitted level ships unless the solver confirms it is winnable. rules-engine : the maze is a grid with rules-as-data (wall bits per cell) + movement rules + win=reach-exit. mz_seal isolates a cell (the gate's negative control: a deliberately-broken level the solver MUST catch). Deterministic (LCG seed) -> reproducible emission. Cell = 4 wall bits N=1 E=2 S=4 W=8 (bit4=16 visited, scratch). license_tier: ORIGINAL