Reduce from 5-layer to 3-layer fog: clear (forward cone), explored (light overlay preserving art), and unexplored (solid near-black). Remove peripheral sector handling from fog_state.gd. Also preserve exploration data across texture resizes — previously, resizing the fog texture lost all explored-tile state, causing tiles behind the player to render as unexplored black instead of light fog. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>